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Tender Value
₹7.8 Cr
EMD Value
₹15.6 L
Closing Date
21 May 2026, 4:30 pmClosed
Similar tender results from the same govt authority in the past 3 years.
Executive Engineer, building project department, Vadodara Municipal Corporation
Construction of Community Hall at Chhani TP 13 FP52, Vadodara
300987
PRO No.23/25-26, Building Project
Open
Miscellaneous Works
Vadodara
5 documents required · 5 mandatory
₹10,000
Municipal commissioner ,Vadodara municipal corporation
₹15.6 L
4 May 2026
4 May 2026
4 May 2026
21 May 2026
4 May 2026
Name of Work: Supply, Installation, Testing &
Commissioning of Electrification work & Solar
Rooftop Work for Newly Constructed
Community Hall, TP 13 , Chani, Vadodara
Municipal Corporation, Vadodara (%Rate
GENERAL TECHNICAL SPECIFICATION FOR ELECTRICAL WORKS
SPECIFICATIONS FOR ELECTRICAL WORKS
SR.NO PARTICULARS
1 General Instructions for Electrical Works
2 Technical Specification for LT Panels.
3 Technical Specification for LDBs & PDBs.
4 Technical Specification for LT Cables & Cable Tray.
5 Technical Specification for Internal Wiring.
6 Technical Specification for Lighting Fixtures.
7 Technical Specification for Data, TV & Telephone wiring.
8 Technical Specification for Earthing System.
GENERAL TECHNICAL SPECIFICATION FOR ELECTRICAL WORKS
1 GENERAL INSTRUCTIONS FOR ELECTRICAL WORKS
The scope of this section is to describe materials and systems for electrical installation works
which form together with the project documents, a complete volume of work and quality
All electrical installations shall be of high quality, safe, complete and fully operational including
all necessary items and accessories whether or not specified in details. All electrical works shall
be completed in accordance with the regulations and standards as per the statutory
requirement to the satisfaction of the Employer. The general provisions, special provisions and
general requirements apply to all items of this specification.
The work shall be carried out simultaneously with building work, civil work, etc. and shall be
continued till it is completed satisfactorily along with the completion of essential portions of
the building works.
During the progress of work, completed portion of the building may be occupied and be put to
use by Employer but the contractor will remain fully responsible for the maintenance of
electrical installations till the entire work covered by this contract is satisfactorily completed
by him and handed over to Employer.
It is the intention of the specification and drawings to call for finished work, tested and ready
for operation. Whenever the words “Supply” or “Provide” are used, it shall mean delivery of
material as specified in an assembled manner, ready for installation. Any apparatus, material or
work not shown on drawings but mentioned in the specification or vice versa, or any incidental
accessories necessary to make the work complete and perfect in all respects and ready for
operation, even if not particularly specified, shall be furnished, delivered and installed by the
contractor without additional expenses to Employer. Minor details not usually shown or
specified, but necessary for the proper installation and operation, shall be included in the work
and in the contract.
Electrical contractor shall be Class A licensed Contractor registered with R&B Department of
Gujarat and shall have completion certificate of three similar project Electrical jobs completed
of same cost in last 3 years.
Civil Contractor shall provide the MOU signed with Electrical contractor (Class A) with
Technical bid during bidding process.
2) INTERPRETATION OF PROJECT DOCUMENTS :
The Specification, Drawings and Bill of quantity shall be interpreted in accordance with good
installation practice defined in the appropriate regulations and standards whether specifically
referred to or not. If there are any discrepancies or shortfall in the application of the
regulations to any aspect of this contract or the contractor considers there is anything
detrimental to the standards or inconsistent with his obligations and guarantees, Employer
shall be informed prior to signing the contract and thereafter inform the contractor in writing
the course to be followed. Where the drawings are to a small scale or are expressed in symbolic
terms or are in the form of a diagram, then exact location of items shall not be inferred and in
all cases, the work shall be fully integrated with the work of other traders and with the fabric of
the building. The contractor shall appraise the duties of all plants and equipments taking
GENERAL TECHNICAL SPECIFICATION FOR ELECTRICAL WORKS
account of any additions or variations and shall inform the Employer of any matters which may
affect the design. In all cases the equipment in stalled shall be of appropriate rating for the duty
The Specifications and bill of quantity shall be considered as part of this contract and any work
or material shown on BOQ and not called for in the specification or vice versa, shall be executed
as if specifically called for in both. The drawings indicate the extent and general arrangement of
the Transformer, L.T. panel, H.T. & L.T. cable route layout etc. and are essentially diagrammatic.
The work shall be installed as indicated on the drawings, however, any minor changes found
essential to co-ordinate the installations of this work with other services shall be made without
any additional cost to the Employer. The drawings are for the guidance of the contractor, exact
locations, distances and levels will be governed by the building. The contractor shall examine
all structural and electrical drawings before starting the work, and report to Employer or its
representative, any discrepancies, which in his opinion appear on them, and get them clarified.
If any discrepancy is noticed between General Conditions of Contract, specification, Bill of
quantity and Drawings, the most stringent of the above shall apply. Bill of quantities, for
electrical items, shall be read in conjunction with respective specification. However, in case of
conflict between bill of quantities and the specification, former shall govern.
3) SYSTEM PARTICULARS :
LV : 433 V, 3 Phase, 4 wire, 50 Hz.
Neutral earthing : Solid
4) ABBREVIATIONS :
The following abbreviations have been used in the accompanying specifications, drawings and
bill of quantity.
IS : Indian Standard British
HRC : High Rupturing
GI : Capacity Galvanised
CU : Iron Copper
MS : Mild Steel
MV : Medium Voltage
LV : Low Voltage
PVC : Polyvinyl Chloride
GENERAL TECHNICAL SPECIFICATION FOR ELECTRICAL WORKS
KV HV : Kilo Volts
KW : High Voltage
KVA : Kilo Watt
PF Hz : Kilo Volt Ampere
KWH : Power Factor
XLPE : Frequency
ACB : Kilo Watt Hour
LED : Cross Linked Polyethylene
PLC : Air Circuit Breaker
UPS : Light Emitting Diode
DP : Programmable Logic Controller
IEE : Uninterrupted Power Supply
MCB : Double Pole
TPN : Institute of Electrical Engineers, London
SP : Miniature Circuit Breaker
MCCB : Triple Pole and Neutral
VCB : Single Pole
CT DB : Moulded Case Circuit Breaker
DG : Vacuum Circuit Breaker
BOQ : Current Transformer
SITC : Distribution Board
L.O.I. : Diesel Generator
ELV : Bill of quantity
MP : Supply, Installation, Testing and Commissioning
: Letter of Intent / Acceptance letter
: Extra Low Voltage System
GENERAL TECHNICAL SPECIFICATION FOR ELECTRICAL WORKS
CCTV : Close Circuit Television Public
PA : Address System Fire Alarm Control
NVR : Network Video Recorder
NVMS : Network Video Monitoring Software
5) REGULATIONS AND STANDARDS :
The installation shall conform in all respects to Indian Standard Code of Practice for Electrical
Wiring Installation IS: 732-1983 and IS: 2214 – 1983 (Silver Nitrate Pure and analytical
reagent). It shall also be in conformity with the current Indian Electricity, Rules, Indian
Electricity Act, National Electrical Code and Regulations of the Local Electrical Supply Authority
in so far as these become applicable to the installation. Wherever this specification calls for a
higher standard of material and/or workmanship than those required by any of the above
regulations then this specification shall take precedence over the said regulations and
standard. In general, the materials equipment and workmanship not covered by the above shall
conform to the relevant Indian Standards.
The electrical installation work shall follow Codes, Indian Standard specifications and rules
(Within the best meaning of the same) under this contract.
The following list is given for general guidance only in addition to list given in each individual
section, however all other latest editions of Codes, Indian Standard specifications and Rules
shall also be followed when it is required.
IS: 8623 Low voltage switchgear & control gear assemblies
IS: 10118 Code of Practice for selection, installation and maintenance
Of switchgear and control gear
General requirement for switch gear and control gear for
Voltage not exceeding 1000 Volt A.C. or 1200 Volt D.C.
Low voltage switchgear and control gear
Low voltage fuses
Circuit breakers for out protection for household and
IS: 8828 Similar installations
Earth leakage circuit breaker
IS: 12640 direct acting indicating analog electrical measuring
Current transformers
IS: 2705 Application guide for voltage transformers
IS: 4201 Control switches for voltage up to and indicating 1000 V
A.C. and 1200 V D.C.
GENERAL TECHNICAL SPECIFICATION FOR ELECTRICAL WORKS
IS: 5578 Guide for marking of insulated conductors
IS: 11353 Guide for uniform system of marking and identification of
Conductors and apparatus transmission
Terminal markings for electrical measuring instruments
And their accessories
Specifications for PVC insulated cables for working
IS: 694 Voltage up to and including 1100 volts
Danger notice plates
IS: 2551 Code of practice for earthing
IS: 3043 Guide for safety procedures and practices in electrical work
IS: 5216 Code of practice for fire safety of building: Electrical
IS: 1646 Installation
Indian Electricity Act as amended up to date
Indian Electricity Rules as amended up to date
Rules and Regulations of Bombay Regional Council of Fire Insurance & Association of
India for Electrical wiring.
6) FEES, PERMITS AND TESTS :
The Contractors shall pay for any and all fees and obtain permits required for the installation
work. On completion of the work, the contractor shall obtain and deliver to the Employer,
certificates of final inspection and approval by the local electric supply authority and the
Electrical Inspector.
7) ACTUAL ROUTE OF CABLE :
The location of the cables, panel boards etc. is only indicative, therefore, the actual route of
cables and the location of panel boards may differ from the plans according to the details of the
building construction and the conditions of executions of the installations.
The contractor shall supply and install at his expense all secondary materials and special
fittings found necessary to overcome the interference and to supply the modifications on the
route of cables and conduits that are found necessary during the work, to the complete
satisfaction of the Employer’s representative.
8) MATERIAL AND EQUIPMENT :
All material and equipment shall conform to the relevant standards and shall be new, good
quality, of the approved make and design. The materials and equipment shall confirm to
relevant Indian Standards. The Contractor shall be responsible for the safe custody of all
materials and shall insure them against theft, damage by fire, earthquake etc. A list of items of
materials and equipment, together with sample of each shall be submitted to the Employer
within 10 days of the award of the contract. Any item which is proposed as a substitute, shall be
accompanied by all technical details giving sizes, particular of materials and the manufacturer’s
GENERAL TECHNICAL SPECIFICATION FOR ELECTRICAL WORKS
name and shall be submitted along with the tender or bid offer. At the time of the submission of
proposed substitute the Contractor shall state the credit, if any due to the Employer. In the
event the substitution is approved, all changes and substitutions shall be requested in writing
and approvals obtained in writing from Employer. Employer’s decision in the matter shall be
All materials of the same kind of service shall be identical and made by the same
manufacturers. Any deviation to this rule shall be approved by the Consultant. Top priority
shall be given to the products that have a permanent agent providing spare parts and
maintenance facilities in the same city where the project is situated.
The makes of electrical equipments, components, accessories etc. have been mentioned in
Tender document. However, Client / Electrical Consultant reserves the right to select from the
specified make. Contractor shall clearly indicate in the bid document, the make they have
considered. No extra claim shall be applicable if client / consultant suggests from the
alternative make specified in the tender document.
9) MANUFACTURERS :
Where manufacturers have furnished specific instructions relating to the materials used in this
job, covering points not specifically mentioned in these documents, these instructions shall be
followed in all cases.
Where manufacturer’s names and/or catalogue numbers are given, this is an indication of the
quality, standards and performance required.
When interfacing occurs, equipment shall be mutually compatible in all respects.
Rating of all items shall be appropriate for the conditions on the particular site on which the
items will be used. All the equipment shall be fit for continuous work under the worst
conditions of site and shall be rated for the following ambient condition.
Outdoor temperature 50 deg.c.
Temperature under shed 45 deg.c.
Salty, dusty and humid
11)INSPECTION AND TESTING :
Employer’s representative reserves the right to request inspection and testing at
manufacturer’s works at all reasonable times for this contract. Tests on site of completed
works shall demonstrate, among other things:
1. That the equipment installed complies with specification in all particulars and is of the
correct rating for the duty and site conditions.
2. That all items operate efficiently and quietly to meet the specified requirements.
3. That all circuits are correctly fused and protected and that protective devices are
properly co-ordinated.
GENERAL TECHNICAL SPECIFICATION FOR ELECTRICAL WORKS
4. That all non current carrying metal work is properly and safely grounded in accordance
with the specifications.
5. The contractor shall provide all necessary instruments and labour for testing, shall make
adequate records of test procedures and readings, shall repeat any tests requested by
the Employer and shall provide test certificates signed by a properly authorised person.
Such test certificates shall cover all works.
6. If tests fail to demonstrate the satisfactory nature of the installation or any part thereof
then no claims for the extra cost of modifications, replacements or re-testing will be
considered. Employer’s decision as to what constitutes a satisfactory test shall be final.
7. The above general requirements as to testing shall be read in conjunction with any
particular requirements specified elsewhere.
12) TEST CERTIFICATES :
The contractor shall submit test certificates for all the electrical material / system installed.
These shall be issued by a government recognized inspection office certifying that all
equipment, materials, construction and functions are in agreement with the requirements of
these specifications, ISI and when ISI is not applicable other approved certifying agencies.
13) INSTRUCTION MANUAL :
The contractor shall prepare and produce instruction, operation and maintenance manuals in
English for the use, operation and maintenance of the supplied equipment and installations,
and submit 3 sets to Employer, at the time of handing over.
14) SAMPLES AND CATALOGUES :
Before ordering the material necessary for these installations, the contractor shall submit to
Employer for approval, a sample of every kind of material such as cables, conductors, conduits,
switches, socket outlets, circuit breakers, lighting fixtures, boxes etc. along with the catalogues.
For big items such as switchboards, the submission of catalogues shall be enough. Prior to
ordering any electrical equipment / material / system, the contractor shall submit to Employer,
the catalogues, along with the samples, at least from three different manufacturers. After the
selection of manufacturer by Employer, the contractor shall arrange inspection and testing at
the manufacturer’s factory or assembly shop for final approval. No material shall be procured
prior to the approval of the Electrical consultant & Data sheets shall be signed and stamped by
consultant and one copy to be submitted to Client.
15) VENDOR AND SHOP DRAWINGS :
The contractor shall prepare and submit to Employer, for his approval, two sets of vendor
detailed drawings of all distribution boards, switch boards, outlet boxes, special pull boxes and
other likewise material, equipment to be fabricated by the contractor, or other vendor within
15 days of signing of the contract.
Before starting the work, the contractor shall submit to Employer for his approval in the
prescribed manner, the shop / execution drawings for the entire installation, specially the main
connections and junctions, the route of conduits and cables, no. and size of wires drawn
through the conduits, location of all the outlet points, and switch boards and distribution
boards and any other information required by Employer. Employer reserves the right to alter
GENERAL TECHNICAL SPECIFICATION FOR ELECTRICAL WORKS
or modify these drawings if they are found to be insufficient or not complying with the
established technical standards or if they do not offer the most satisfactory performance or
accessibility for maintenance.
16) AS BUILT DRAWINGS :
At the completion of work and before issuance of certificate of virtual completion the
contractor shall submit to Employer, three sets of layout drawing drawn at appropriate scale
indicating the complete wiring system “as installed”. These drawings must provide (in plan,
folded elevation and section)
a. Location and details of distribution boards, main switches, switchgear and other
Location of all earthing stations, route and size of all earthing conductors,
b. manholes etc.
Route and particulars of all cables.
Lighting layout plans with conduit routing layout/cable tray for all the floors
d. along with circuit distribution details.
External Area Lighting Plan
17) GUARANTEE :
At the close of the work and before issuance of final certificate of virtual completion by
Employer, the contractor shall furnish written guarantee indemnifying Employer against
defective materials and workmanship for a period of one year after completion. The contractor
shall hold himself fully responsible for reinstallation or replacement, free of cost to Employer,
a. Any defective work or material supplied by the contractor.
b. Any material or equipment supplied by Employer, which is damaged or destroyed as a
result of defective workmanship by the contractor.
c. Any material or equipment damaged or destroyed as a result of defective workmanship
by the contractor.
18) SPECIAL NOTES FOR BIDDER :
a. All the major electrical components like Transformers, DGs, HT MV LT switchgears, DBs,
UPS, etc including the external & internal electrical distribution system, earthing
systems & various equipments (which is supplied &/or installed by the contractor) shall
be maintain for 2 years from the date of virtual completion of work at free of cost.
b. The contractor should co-operate & coordinate for LT connections to LT panel board of
various blocks, so that day to day work should not suffer.
c. It is in the scope of Contractor to preparing necessary drawing submitting to authorities
(i.e. Local supply co., pollution control board, Electrical Inspector, etc), getting their
approval / sanction and final certificate to energize the sub-station equipment’s. Filling
the necessary application to supply co. following up and getting the supply filling the
GENERAL TECHNICAL SPECIFICATION FOR ELECTRICAL WORKS
necessary test report to the supply co. inclusive. All official / statutory fees shall be paid
by clients & all other required expenses shall be on the contractors account; no extra
payment shall be paid to contractor for said job.
d. LT Panels shall be approved on site by Engineer in Charge & Electrical Consultant.
e. Contractor shall submit Shop drawings for approval to Electrical consultant based on
tender drawings before execution which shall not be on chargeable basis.
f. The MCB and MCB DBs must be of same make.
g. Make of components required to be used by contractor to complete the installation, if
by not mentioned anywhere, shall be required to GOT IT APPROVED
Client/Architect/Consultant before installation in writing manner.
h. Within a week of work order, the contractor shall submit the sample of each item /
component of above mentioned approved make for the approval of the
Client/Architect/Consultant.
2 TECHNICAL SPECIFICATION FOR LT PANELS
1) SCOPE OF WORK
1. Main Distribution Panels, Sub-Distribution Panels and Final Distribution shall be covered under
3 Phtahsise/sseicntgiolen.pPhaans el, s/Boards shall be suitable for operation on
415/240 volts, 50 cycles, 4 wire system with neutral grounded at transformer. All Distribution
panels shall be CPRI tested design and manufactured by an approved manufacturer. CPRI
certificate shall be made available.
2. Distribution panels shall comply with the latest Relevant Indian Standards and Electricity Rules
and Regulations and shall be as per IS-13947-1991.
2) CONSTRUCTION FEATURES:
1. Distribution panels shall be 2 mm thick sheet steel cabinet for indoor installation, dead front,
floor mounting/wall mounting type and shall be form as per site construction requirements.
2. The Distribution panels shall be totally enclosed, completely dust and vermin proof and shall
be with hinged doors and folded covers, Neoprene gasket, padlocking arrangement and bolted
3. All removable/ hinged doors and covers shall be grounded by flexible standard connectors.
4. Distribution panel shall be suitable for the climatic conditions as specified in Special
Conditions. Steel sheets used in the construction of Distribution panels shall be 2 mm thick and
shall be folded and braced as necessary to provide a rigid support for all components.
5. Joints of any kind in sheet metal shall be seam welded, all welding, slag shall be rounded off and
welding pits wiped smooth with plumber metal.
6. The general construction shall confirm to IS-8623-1977 (Part-1) for factory built assembled
switchgear & control gear for voltage up to and including 1100 V AC.
GENERAL TECHNICAL SPECIFICATION FOR ELECTRICAL WORKS
7. All panels and covers shall be properly fitted and square with the frame, and holes in the panel
correctly positioned.
8. Fixing screws shall enter into holes tapped into an adequate thickness of metal or provided
with wing nuts.
9. Self threading screws shall not be used in the construction of Distribution panels.
10. A base channel of 75 mm x 40 mm x 5 mm thick shall be provided at the bottom for floor
mounted panels.
11. Minimum operating clearance of 300 mm shall be provided between the floor of Distribution
panels and the lowest feeder compartment.
12. Distribution panels shall be of adequate size with a provision of spare switchgear as indicated
on the Single Line Diagram. Feeders shall be arranged in multi-tier.
13. Knockout holes of appropriate size and number shall be provided in the Distribution panels in
conformity with the location of cable/conduit connections.
14. Removable sheet steel plates shall be provided at the top to make holes for additional cable
entry at site if required.
15. Every cabinet shall be provided with Trifoliate or engraved metal name plates.
16. All panels shall be provided with circuit diagram engraved on PVC sheet.
17. All live accessible connections shall be shrouded and shall be finger touch proof and minimum
clearance between phase and earth shall be 20 mm and phase to phase shall be 25 mm.
3) BUSBAR CONNECTIONS:
1. Bus bar and interconnections shall be of high conductivity electrolytic grade aluminium /
copper as indicated in the bill of quantities complying with requirement of IS : 5082 –
and of rectangular cross section suitable for carrying the rated full load current and short
circuit current and shall be extendable on either side.
2. Bus bars and interconnections shall be insulated with heat shrinkable sleeve of 1.1 KV grade
and shall be colour coded.
3. Bus bars shall be supported on glass fiber reinforced thermosetting plastic insulated supports
at regular intervals to withstand the force arising from in case of short circuit in the system.
4. All bus bars shall be provided in a separate chamber and all connections shall be done by
5. Additional cross sectional area to be added to the bus bar to compensate for the holes.
6. All connections between bus bars and breakers shall be through solid copper / aluminium
strips of proper size to carry full rated current and insulated with insulating sleeves.
7. Maximum current density for the bus bars shall be 0.8-1A/sq.mm for aluminium and
A/sq.mm for copper bus bars.
GENERAL TECHNICAL SPECIFICATION FOR ELECTRICAL WORKS
8. The busbar shall be housed in a separate compartment. The busbar shall be isolated with
mm. thick bakelite sheet to avoid any accidental contact. The busbar shall be arranged such
that minimum clearance between the busbar are maintained as below :
Between phases : 25 mm. minimum
Between phases and neutral : 25 mm.
Between phases and earth : 25 mm.
Between neutral and earth : 20 mm. minimum
Maximum allowable temperature for the Bus bar to be restricted to 85 deg C
4) TEMPERATURE – RISE LIMIT
1. Unless otherwise specified, in the case of external surface of enclosures of bus bar
compartment which shall be accessible but do not need to be touched during normal operation,
an increase in the temperature rise limits of 25° C above ambient temperature shall be
permissible for metal surface and of 15° C above ambient temperature for insulating surfaces
as per IS 8623(Part-2)
2. All main distribution panels and sub distribution panels shall be provided with MCCB of
appropriate capacity as per Single Line Diagram.
3. All final Distribution boards shall be provided with Miniature Circuit Breakers.
4. Final Single Phase Distribution boards shall be connected to the incoming supply through
double pole MCB units & earth leakage circuit breakers.
5. All wiring for final distribution boards shall be concealed behind 5 mm thick bakelite sheet or
M S sheet cover.
6. All Distribution boards shall be completely factory wired, ready for connection.
7. All the terminals shall be of proper current rating and sized to suit individual feeder
8. Each circuit shall be clearly numbered from left to right to correspond with wiring diagram.
9. All the switches and circuits shall be distinctly marked with a small description of the service
10. Continuous earth bus sized for prospective fault current shall be provided with arrangement
for connecting to station earth at two points. Hinged doors/ frames shall be connected to earth
through adequately sized flexible braids.
5) CABLE COMPARTMENTS
1. Cable compartment of adequate size shall be provided in the Distribution panels for easy
clamping of all incoming and outgoing cables entering from the top/bottom. Adequate
supports shall be provided in cable compartment to support cables.
GENERAL TECHNICAL SPECIFICATION FOR ELECTRICAL WORKS
6.1 MOULDED CASE CIRCUIT BREAKER (MCCB)
6.1.1 The MCCB should be current limiting type with trip time of less than 10 msec under short
circuit conditions. The MCCB should be either 3 or 4 poles as specified in BOQ. MCCB shall
comply with the requirements of the relevant standards IS13947 – Part 2/IEC 60947-2 and
should have test certificates for Breaking capacities from independent test authorities CPRI
/ ERDA or any accredited international lab.
6.1.2 MCCB shall comprise of Quick Make -break switching mechanism, arc extinguishing device
and the tripping unit shall be contained in a compact, high strength, heat resistant, flame
retardant, insulating moulded case with high withstand capability against thermal and
mechanical stresses
6.1.3 The breaking capacity of MCCB shall be as specified in the schedule of quantities.
6.1.4 The rated service breaking capacity (Ics) should be equal to rated ultimate breaking
capacities (ICU).
MCCBs for motor application should be selected in line with Type-2 Co-ordination as per
The breaker as supplied with ROM should meet IP54 degree of protection.
6.2 CURRENT LIMITING & COORDINATION
6.2.1 The MCCB shall employ maintenance free minimum let-through energies and capable of
achieving discrimination up to the full short circuit capacity of the downstream MCCB. The
manufacturer shall provide both the discrimination tables and let-through energy curves
Protection Functions
6.2.2 MCCBs with ratings up to 200 A shall be equipped with Thermal-magnetic (thermal for
overload and magnetic for short-circuit protection) trip units (as per Single line diagram).
Microprocessor MCCBs with ratings 250A and above shall be equipped with
microprocessor based trip units (as per Single line diagram).
Microprocessor and thermal-magnetic trip units shall be adjustable and it shall be possible
6.2.4 to fit lead seals to prevent unauthorised access to the settings
Microprocessor trip units shall comply with appendix F of IEC 60947-2 standard
6.2.5 (measurement of rms current values, electromagnetic compatibility, etc.)
Protection settings shall apply to all poles of circuit breaker.
6.2.6 All Microprocessor components shall withstand temperatures up to 125 °C.
6.2.7 Rotary handles to be provided for operation where ever required as indicated in Single line
GENERAL TECHNICAL SPECIFICATION FOR ELECTRICAL WORKS
6.3.1 Original test certificate of the MCCB as per IEC 60947-1 &2 or IS13947 shall be furnished.
Pre-commissioning tests on the switch board panel incorporating the MCCB shall be done
as per standard specifications.
6.4 INTERLOCKING
6.4.1 Moulded, case circuit breakers shall be provided with the following interlocking devices for
interlocking the door of a switch board.
o Handle interlock to prevent unnecessary manipulations of the breaker.
o Door interlock to prevent the door being opened when the breaker is in ON
Defeat-interlocking device to open the door even if the breaker is in ON position.
o PLC controller to operate the Motorized Breakers in sequence as indicated logic
diagram in SLD.
6.4.2 The MCCB shall be current limiting type and comprise of quick make – Break switching
mechanism. MCCBs shall be capable of defined variable overload adjustment. All MCCBs
rated 200 Amps and above shall have adjustable over load & short circuit pick-up both in
Thermal magnetic and Microprocessor Trip Units.
6.4.3 All MCCB with microprocessor based release unit, the protection shall be adjustable
Overload, Short circuit and earth fault protection with time delay.
The tripcommand shall override all other commands.
6.5 MINIATURE CIRCUIT BREAKER (MCB)
6.5.1 Miniature Circuit Breaker shall comply with IS-8828-1996/IEC898-1995. Miniature circuit
breakers shall be quick make and break type for 240/415 VAC 50 Hz application with
magnetic thermal release for over current and short circuit protection.
6.5.2 The breaking capacity shall not be less than 10 KA at 415 VAC. MCBs shall be DIN mounted.
The MCB shall be Current Limiting type (Class-3). MCBs shall be classified (B, C, D ref IS
standard) as per their Tripping Characteristic curves defined by the manufacturer.
6.5.3 The MCB shall have the minimum power loss (Watts) per pole defined as per the IS/IEC
and the manufacturer shall publish the values.MCB shall ensure complete electrical
isolation & downstream circuit or equipment when the MCB is switched OFF.
6.5.4 The housing shall be heat resistant and having high impact strength. The terminals shall be
protected against finger contact to IP20 Degree of protection. All DP, TP, TPN and 4 Pole
miniature circuit breakers shall have a common trip bar independent to the external
operating handle.
6.6 RESIDUAL CURRENT CIRCUIT BREAKER CURRENT OPERATED TYPE (RCCB)
System of Operation
GENERAL TECHNICAL SPECIFICATION FOR ELECTRICAL WORKS
6.6.1 Residual Current Circuit Breaker shall confirm to IEC 61008.RCCB shall work on the
principle of core balance transformer.
6.6.2 The incoming shall pass through the torroidal core transformer. As long as the currents in
the phase and neutral shall be the same, no electro motive force shall be generated in
the secondary winding of the transformer.
6.6.3 In the event of a leakage to earth, an unbalance shall be created which shall cause a
current to be generated in the secondary winding, this current shall be fed to a highly
sensitive miniature relay, which shall trip the circuit if the earth leakage current exceeds
a predetermined critical value. RCCB shall be current operated independent of the line
voltage, current sensitivity shall be of 30 mA at 240/415 volts AC and shall have a
minimum of 20,000 electrical operations.
Mechanical Operation
6.6.4 The moving contacts of the phases shall be mounted on a common bridge, actuated by a
rugged toggle mechanism. Hence, the closing /opening of all the three phases shall occur
simultaneously. This also shall ensure simultaneous opening of all the contacts under
tripping conditions.
Neutral Advance Feature
6.6.5 The neutral moving contact shall be so mounted on the common bridge that, at the time of
closing, the neutral shall make contact first before the phases; and at the time of opening,
the neutral shall breaks last after allowing the phases to open first. This is an important
safety feature which is also required by regulations.
Testing Provision
6.6.6 eAatretsht ldeeavkiacgeesdheatlel cbteioincorporated to check the integrity of the
system and the tripping mechanism. When the unit is connected to service, pressing the
test knob shall trip the ELCB / RCCB and the operating handle shall move to the "OFF"
4) ELECTRICAL POWER AND CONTROL WIRING CONNECTION : Terminal for both incoming
1. and outgoing cable connections shall be suitable for 1100 V grade,
aluminium / copper conductor PVC insulated and sheathed, armoured cable and shall be
suitable for connections of solderless sockets for the cable size as indicated on the appended
drawings for the Panels.
Power connections for incoming feeders of the main Panels shall be suitable for 11000 V
3. aluminium conductor (XLPE) cables.
Both control and power wiring shall be brought out in cable alley for ease of external
connections, operation and maintenance.
Both control and power terminals shall be properly shrouded.
GENERAL TECHNICAL SPECIFICATION FOR ELECTRICAL WORKS
5.10% spare terminals shall be provided on each terminal block. Sufficient terminals shall be
provided on each terminal block, so that not more than one outgoing wire is connected to per
6T .erminal strips for power and control shall preferably be separated from each other by
suitable barriers of enclosures.
7.Wiring inside the modules for power, control, protection and instruments etc. shall be done
with use of 660 / 1100 V grade, PVC insulated copper conductor cables conforming to IS :
and IS : 8130. Power wiring inside the starter module shall be rated for full current raring of
respective contactor, but not less than 4.0 sq.mm. Cross-section area. For current transformer
circuits, 2.5 sq.mm. Copper conductor wire shall be used. Other control wiring shall be done
with 1.5 sq.mm. Copper conductor wires. Wires for connections to the door shall be flexible. All
conductors shall be crimped with solderless sockets at the ends before connections are made
to the terminals. All wires shall be FRLS grade.
Control power for the Motor starter module shall be taken from the respective module
switchgear outgoing. Control power wiring shall have control fuses, (HRC fuse type) for circuit
protection. All indicating lamps shall be protected by HRC fuses.
Particular care shall be taken to ensure that the layout of wiring is neat and orderly.
Identification ferrules shall be filled to all the wire termination for ease of identification and to
facilitate checking and testing.
10. “CUPAL” washers shall be used for all copper and aluminium connections.
11. Final wiring diagram of the Panels power and control circuit with ferrules numbers shall be
submitted alongwith the Panels as one of the documents against the contracts.
1. The outgoing terminals and neutral link shall be brought out to a cable alley suitably located
and accessible from the panel front. The current transformers for instruments metering shall
be mounted on the disconnecting type terminal blocks. No direct connection of incoming or
outgoing cables to internal components of the distribution board is permitted, only one
conductor may be connected in one terminal.
1. A horizontal PVC wire way with screwed covers shall be provided at the top to take
interconnecting control wiring between different vertical sections.
1. Engraved PVC labels shall be provided on all incoming and outgoing feeders. Single line circuit
diagram showing the arrangements of circuit inside the distribution board shall be pasted on
inside of the panel door and covered with transparent laminated plastic sheet.
8) NAME PLATE :
1. A name plate with the Panels designation in bold letters shall be fixed at top of the central
panel. A separate name plate giving feeder details shall be provided for each feeder module
GENERAL TECHNICAL SPECIFICATION FOR ELECTRICAL WORKS
I2n. side the feeder compartments, the electrical components, equipments, accessories like
switchgear, control gear, lamps, relays etc. shall suitably be identified by providing stickers.
3.Engraved name plates shall preferably be of 3 ply, (Red-White-Red or Black-White-Black)
lamicold sheet. However, black engraved perpex sheet name plates shall also be acceptable.
Engraving shall be done with square groove cutters.
4N. a m e plate shall be fastened by counter sund screws and not by adhesives.
9) DANGER NOTICE PLATES :
1. The danger notice plate shall be affixed in a permanent manner on operating side of the Panels.
2. The danger notice plate shall indicate danger notice both in Hindi and English and with a sign
of skull and bones.
The danger notice plate, in general, meet the requirements of local inspecting authorities.
Overall dimensions of the danger notice plate shall be 200 mm. wide x 150 mm. high.
The danger notice plate shall be made from minimum 1.6 mm. thick mild steel sheet and after
5. due pre-treatment to the plate, the same shall be painted white with vitreous enamel paint on
both front and rear surface of the plate.
The letters, the figures, the conventional skull and bones etc. shall be positioned on plate as per
6. recommendation of IS: 2551-1982.
The said letters, the figures and the sign of skull and bones shall be painted in signal red colour
7. as per IS: 5-1978.
The danger plate shall have rounded corners. Location of fixing holes for the plate shall be
8. decided to suit design of the Panels.
The danger notice plate, if possible, be of ISI certification mark.
1. Earthing shall be provided as per IS: 3043-1987.
12. All sheet steel work shall undergo a process of degreasing, pickling in acid, cold rinsing,
phosphating, passivaiting (seven tank processing) and then painted with electrostatic paint
(Powder coating).
13. The shade of colour of panel inside/outside shall be as per BOQ confirming to IS Code No.5.
1. Engraved PVC labels shall be provided on all incoming and outgoing feeder.
2. Circuit diagram showing the arrangements of the circuit inside the distribution panels shall be
pasted on inside of the panel door and covered with transparent plastic sheet.
GENERAL TECHNICAL SPECIFICATION FOR ELECTRICAL WORKS
1. All voltmeters and indicating lamps shall be through MCB’s.
2. Meters and indicating instruments shall be flush type.
3. All CT’s connection for meters shall be through Test Terminal Block (TTB).
4. CT ratio and burdens shall be as specified on the Single line diagram/BOQ.
14) CURRENT TRANSFORMERS
1. Current transformers shall be provided for Distribution panels carrying current in excess of
All phase shall be provided with current transformers of suitable VA burden with 5 amps
2. secondaries for operation of associated metering.
The CTs shall confirm to relevant Indian Standards. The design and construction shall be dry
3. type, epoxy resin cast robust to withstand thermal and dynamic stresses during short circuits.
Secondary terminals of CTs shall be brought out suitable to a terminal block which shall be
4. easily accessible for testing and terminal connections.
The protection CTs shall be of accuracy class 5P10 and measurement CTs shall be of accuracy
15) POTENTAIL FREE CONTACTS
1. Potential free contacts shall be provided for connection to Building Automation System in
panels indicated in Schedule of Quantities.
16) INDICATING PANEL
1. All meters and indicating instruments shall be in accordance with relevant Indian Standards.
Meters shall be flush mounted type. Indicating lamps shall be of low burden, and shall be
backed up with 2 amps MCB/MPCB as per relevant fault level and toggle switch.
1. Testing of panels shall be as per following codes:
I. IS: 8623 (Part -I) 1977 for factory built assemblies of switch gear for voltages
upto and including 1000 VAC.
II. IS: 13947 : 1993 Degree of protection
III. IS: 5578 & 11353:1985 Arrangement of bus bars.
1. In wiring a distribution panel it shall be insured that total load of various distribution panel
and/or consuming devices is divided evenly between the phases and number of ways as per
Consultants drawing.
GENERAL TECHNICAL SPECIFICATION FOR ELECTRICAL WORKS
19) INSTALLATION
1. Installation of all LT panels shall include but not limited to the following to complete the
installation, testing and commissioning:
Transporting materials from stores to exact location of installation.
Supply and installation of required base frame made of MS angle or channel sections and duly
3. painted with black paint.
Positioning, aligning, fixing, assembling, and installation of LT panel issued free of cost by Client
4. after carrying out proper cleaning and inspection.
Site supervision, testing for proper functioning / operation, and pre-commissioning tests.
20) COMMISIONING & ONSITE TESTING
1. All switchboards shall be tested for dielectric test with 1000V megger.
2. All earth connections shall be checked for continuity.
3. All busbar connections shall be checked and tightened properly.
4. All cable terminations and terminal shrouding shall be checked if they are properly done.
5. The operation of protective devices shall be tested by secondary injection test.
6. The operation of circuit breaker shall be tested for all interlocks.
7. Functional test shall be done for all ACBs, MCCBs and other components.
8. Indicating lamps and meters shall be checked for proper working.
21) WORKMANSHIP:
1. The contractor shall erect the panel at site in co-ordination with the supplier if required.
2. He should check for loose ends on the part of the supplier and shall inform client and
consultant for the same.
Physical and continuity tests shall be carried out by contractor.
Also the field tests carried out by the supplier shall be recorded by the contractor.
22) MODE OF MEASUREMENT:
1. Contractor shall be paid for one panel erection as per BOQ Quantities part.
GENERAL TECHNICAL SPECIFICATION FOR ELECTRICAL WORKS
3 TECHNICAL SPECIFICATION FOR LDB & PDB
1) SCOPE OF WORK
1. Distribution Boards (DBs) shall be suitable for operation on 3 Phase/single phase,
415/240 volts, 50 cycles, neutral grounded at transformer. The DB shall be minimum di-
electric strength of 1.5 KV / Sec. All Distribution Boards shall manufactured by a
manufacturer listed in Appendix-I.
2. LDB’s shall comply with the latest Relevant Indian Standards and Electricity Rules and
Regulations and shall be as per IS-13947-1991.
2) CONSTRUCTION FEATURES
1. DB’s shall be made out of 1.6 mm thick high quality CRCA sheet steel and shall be pre-
treated and powder coated sheet steel used in the construction of LDB shall be folded and
braced as necessary to provide a rigid support for all component.
2. DB shall be suitable for indoor / outdoor installation, wall mounting free standing type, in
double door construction.
3. The Final Distribution Boards shall be totally enclosed, completely dust and vermin proof
and shall be with hinged doors, Neoprene gasket, padlocking arrangement.
4. All removable/ hinged doors and covers shall be grounded by 1.0 sqm tinned stranded
copper connectors.
5. Final Distribution Boards shall be suitable for the climatic conditions. Joints of any kind in
sheet metal shall be seam welded, all welding, slag shall be rounded off and welding pits
wiped smooth with plumber metal.
6. The general construction shall confirm to IS-8623-1977 (Part-1) for factory built assembled
switchgear & control gear for voltage up to and including 1100 V AC.
7. All panels and covers shall be properly fitted and square with the frame, and holes in the
panelcorrectly positioned. Fixing screws shall enter into holes tapped into an adequate
thickness of metal or provided with wing nuts. Self threading screws shall not be used in
theconstruction of LDBs.
8. Knockout holes of appropriate size and number shall be provided in the LDB’s in conformity
withthe location of cable/conduit connections. Detachable sheet steel gland plates shall be
provided at the top / bottom to make holes for additional cable entry at site if required.
3) DISTRIBUTION BOARDS SHALL COMPRISE OF THE FOLLOWING:
3.1 A panel for mounting where appropriate incoming supply circuit breaker & other
auxiliaries for Control & distribution as required.
GENERAL TECHNICAL SPECIFICATION FOR ELECTRICAL WORKS
3.2 Installations accessories shall be part of the DB for fixing conductor and rails for
mounting MCB’s and RCCB’s etc. Neutral bus bars & earthing bus bars required in the
circuit. All busbars in the LDB shall be insulated type.
3.3 Service cable /interconnection shall be part of the Distribution Boards.
3.4 The board shall be installed at a height such that the operating is within reach of the
normal human height i.e. 1.2 to 1.8 meters from finish floor level.
3.5 Degree of protection shall be IP-52 for indoor application, IP-54 for kitchen & laundry
and IP-55 for outdoor application.
3.6 All three phase distribution boards shall have 4 rows and single phase distribution
boards shall have single rows for housing of MCB’s and RCCB’s unless noted
3.7 Phase segregation to be maintained in all three phase distribution boards.
3.8 Earthing shall be provided in each LDB’s.
3.9 MINIATURE CIRCUIT BREAKER (MCB)
3.9.1 MCB's shall have quick make and break no welding self-wiping silver alloy contacts
for 10 KA short circuit both on the manual and automatic operation.
3.9.2 Each pole of the breaker shall be provided with inverse time thermal over load and
instantaneous over current tripping elements, with trip free mechanism.
3.9.3 In case of multi-pole breakers, the tripping must be on all the poles and operating
handle shall be common. Breakers must confirm to BS 3871 with facility for locking
in OFF position.
3.9.4 Pressure clamp terminals for stranded/solid conductor insertion are acceptable up to
4 sq.mm. Aluminium or 1.5 sq.mm.
3.9.5 Copper and for higher ratings, the terminals shall be suitably shrouded. Wherever
MCB isolators are specified they are without the tripping elements.
3.10 RESIDUAL CURRENT CIRCUIT BREAKER CURRENT OPERATED TYPE (RCCB)
3.10.1 The RCCB should suffices all the requirements of IS as per code IS - 12640 - 1988. The
RCA should be current operated and not on line voltage.
3.10.2 The RCCB should ensure mainly the following functions:
o Measurement of the fault current value.
o Comparison of the fault current with a reference value.
o The RCCB should have a torroidal transformer which has the main conductors of
primary (P - N) which check the sum of the current close to zero.
o All metal parts should be inherently resistant to corrosion and treated to make
GENERAL TECHNICAL SPECIFICATION FOR ELECTRICAL WORKS
them corrosion resistant. It should be truly current operated. It should operate on
o core balance torroidal transformer. Its accuracy should be ± 5 %. It should
o operate even in case of neutral failure. It should trip at a present leakage current
o within 100 mA Its enclosure should be as per IP 30. Its mechanical operation life
o should be more than 20,000 operations. It should provide full protection as
o envisaged by IE rules - 61-A, 71 - ee, 73 - ee,
1985 and also rule 50 of IE rule1956.
o It should conform to all national and international standards like IS: 8828-1993,
o IS: 12640-1988, BS 4293 - 1983, CEE 27 (International commission Rules for the
approved of electrical equipment).
1. Earthing shall be provided as per IS: 3043-1987.
1. All sheet steel work shall undergo a process of degreasing, pickling in acid, cold rinsing,
phosphating, passivaiting (seven tank processing) and then painted with electrostatic paint
(Powder coating). The shade of colour of panel inside/outside shall be of Siemens gray paint
shade no. RAL-7032 of IS Code No.5.
1. Engraved PVC labels shall be provided on all incoming and outgoing feeder. Circuit diagram
showing the arrangements of the circuit inside the distribution panels shall be pasted on
inside of the panel door and covered with transparent plastic sheet.
1. Testing of panels shall be as per following codes:
i. IS: 8623 (Part -I) 1977 for factory built assemblies of switch gear for voltages upto
and including 1000 VAC.
ii. IS: 13947 : 1993 Degree of protection
1. In wiring a distribution panel it shall be insured that total load of various distribution panel
and/or consuming devices is divided evenly between the phases and number of ways as per
Consultants drawing.
GENERAL TECHNICAL SPECIFICATION FOR ELECTRICAL WORKS
9) WORKMANSHIP:
1. The D.B. shall be properly grouted in the wall in concealed manner taking care that the
powder coating is not scratched and dents are not formed on the D.B., MCBs and ELCBs.
2. In the distribution boards shall be fixed as per the circuit details provided.
3. All the wires terminating in the MCBs and the ELCBs shall be lugged for proper contact and
ferrules depicting the circuit nos shall be provided. D.B.s mounted in concealed manner
shall have a groove around it so as to save the finish of the plaster and colour during future
opening of the door.
The distribution boards shall have circuit chart tagged on the door for future maintenance.
4. Danger notice plates shall be fitted to the distribution boards with screws and not stuck so
as to assure its presence for a longer duration.
10) MODE OF MEASUREMENT:
1. The distribution boards shall be measured in Nos as per BOQ Quantities.
4 TECHNICAL SPECIFICATION FOR LT CABLES & CABLE TRAY.
1) SCOPE OF WORK
1. The Medium voltage cables shall be supplied, laid, connected, tested and commissioned in
accordance with the drawings, specifications, relevant Indian Standards specifications,
manufacturer’s instructions. The cables shall be delivered at site in the original drums with
manufacturer’s name, size and type clearly written on the drums.
2. All cables shall be adequately protected against any risk of mechanical damage to which
they may be liable in normal conditions of handling during transportation, loading,
3. The cable shall be supplied in single length i.e. without any intermediate joint or cut unless
specifically approved by the client.
The cable ends shall be suitably sealed against entry of moisture, dust, water etc. with cable
4. compound as per standard practise.
1. The MV cables shall be cross linked polyethylene (XLPE) insulated PVC sheathed of
volts grade as asked for in the schedule of quantities. Cables upto 10 sq.mm shall be with
copper conductor and 16 sq.mm and above shall be with aluminium conductor.
3) Technical Requirements:
1. All XLPE Aluminium/Copper Power cables shall be 1100 Volts grade, multi core
constructed as per IS : 7098 Part-I of 1988 as follows :
GENERAL TECHNICAL SPECIFICATION FOR ELECTRICAL WORKS
1.1 Stranded Aluminium /Copper conductor in case of 10 sq.mm. And above whereas solid
conductor in case of 10 sq.mm. And below.
1.2 Cores laid up.
1.3 The inner sheath should be bonded over with thermo-plastic material for protection
against mechanical and electrical damage.
1.4 Armoring should be provided over the inner sheath to guard against mechanical damage.
Armouring should be Galvanised steel wires or galvanised steel strips. (In single core
cables used in A.C. system armouring should be non-magnetic hard aluminium
Wires/Strips. Round steel wires should be used where diameter over the inner sheath
does not exceed 13 mm; above 13 mm flat steel armour should be used. Round wire of
different sizes should be provided against specific request.)
1.5 The outer sheath should be specially formulated heat resistant black PVC compound
conforming to the requirement of type ST2 of IS: 5831-1984 extruded to form the outer
2. Conductor shall be of electrolytic Aluminium/Copper conforming to IS : 8130 and are
compact circular or compact shaped.
3. Insulation shall be of XLPE type as per latest IS general purpose insulation for
maximum rated conductor temperature 70 degree centigrade.
4. In Inner sheath laid up cores shall be bonded over with thermoplastic material for
protection against mechanical and electrical damage.
Insulation, inner sheath and outer sheath shall be applied by extrusion and lapping up
5. process only.
6. Uncoated, annealed copper / aluminium, of high conductivity, upto 4 mm2 size the
conductor shall be solid and above 4 mm2 the conductors shall be concentrically stranded
7. Repaired cables shall not be used.
8. Current ratings of the cables shall be as per IS:
9. The XLPE insulated cables shall conform to latest revision of IS and shall be read along with
this specifications. The Conductor shall be stranded Aluminium/Copper circular/ sector
shaped and compacted. In multi core cables the core shall be identified by red, yellow, blue
and black coloring of insulation.
10. The cables shall be suitable for laying in racks, ducts, trenches, conduits and underground
buried installation with uncontrolled back fill and chances of flooding by water.
11. Progressive automatic in line sequential marking of the length of cables in meters at every
one meter shall be provided on the outer sheath of all cables.
12. Cables shall be supplied in non returnable wooden drums as per IS:
13. Both ends of the cables shall be properly sealed with PVC/Rubber caps so as to eliminate
ingress of water during transportation, storage and erection.
14. The product should be coded as per IS: - 7098 Part-I as follows:-
GENERAL TECHNICAL SPECIFICATION FOR ELECTRICAL WORKS
Aluminium Conductor A
XLPE Insulation 2X
Steel round wire armour W F
Steel strip armour WW
Steel Double round wire armour
Steel Double strip armour FF
Non-magnetic (Al.) round wire armour WA
Non-magnetic (Al.) strip armour Fa
PVC outer sheath Y
4) CoreIdentifications:
Two core : Red and Black
Three core : Red, Yellow and Blue
Four core : Red, Yellow, Blue and Black
Single core : Green, Yellow for earthing.
Black shall always be used for neutral.
1. All cables shall be inspected by the contractor upon receipt at site and checked for any
damage during transit.
6) Joints in Cables
1. The Contractor shall take care to see that all the cables received at site are apportioned to
various locations in such a manner as to ensure maximum utilization and avoid cable
2. This apportioning shall be got approved by the Owner’s site representative before the cables
are cut to lengths.
3. Where joints are unavoidable heat shrinkable type joints shall be made.
4. The location of such joints shall be got approved from the Owner’s site representative
and shall be identified through a marker.
7) Jointing Boxes for Cables
1. Cable joint boxes shall be installed with heat shrinkable sleeve and of appropriate size,
suitable for XLPE armoured cables of particular voltage rating.
8) Jointing of Cables
1. All cable joints shall be made in suitable, approved cable joint boxes and the filling in of
compound shall be done in accordance with manufactures’ instructions and in an approved
manner. All straight through joints shall be done in epoxy mould boxes with epoxy resin.
2. All cables shall be joined colour to colour and tested for continuity and insulation resistance
before jointing commence.
3. The seals of cables must not be removed until preparations for jointing are completed.
4. Joints shall be finished on the same day as commenced and sufficient protection from the
weather shall be arranged.
GENERAL TECHNICAL SPECIFICATION FOR ELECTRICAL WORKS
5. The conductors shall be efficiently insulated with high voltage insulating tape and by using
of spreaders of approved size and pattern.
6. The joints shall be completely topped up with epoxy compound so as to ensure that the box
is properly filled.
9) Cable End Terminations
1. Cable end termination shall be done in cable terminal box using crimping sockets and
proper size of glands of double compression type.
2. Solderiess crimping type Aluminium/Cu lugs conforming to IS suitable for cable size evenly
crimped with high pressure tool & connected to switchgear terminals with brass/cadmium
plated nut bolts in an approved manner.
10) Bonding of Cables
1. Where a cable enters any piece of apparatus, it shall be connected to the casing by means of
an approved type of armour clamp and gland.
2. The clamps must grip the armouring firmly to the gland or casing, so that no undue stress is
passed on to the cable conductors.
11) Cable Installation in Cable Trays and Cable Trenches.
1. Cables shall be laid by skilled and experienced workmen using adequate rollers to
minimize stretching of the cable.
2. The cable drums shall be placed on jacks before unwinding the cable. Great care shall be
exercised in laying cables to avoid forming kinks.
12) Laying of Cables on Cable Trays
1. The relative position of the cables, laid on the cable tray shall be preserved and the cables
shall not cross each other.
2. At all changes in direction in horizontal and vertical planes, the cable shall be bent smooth
with a radius as recommended by the manufacturers.
3. All cables shall be laid with minimum one diameter gap and shall be clamped at every meter
to the cable tray.
4. Cables shall be tagged for identification with aluminium tag and clamped properly at every
5. Tags shall be provided at both ends and all changes in directions both sides of wall and floor
6. All cable shall be identified by embossing on the tag the size of the cable, place of origin and
7. All cables passing through holes in floor or walls shall be sealed with fire retardant Sealant
and shall be painted with fire retardant paint upto one meter on all joints, terminations
and both sides of the wall crossings by “VIPER CABLE RETARD”.
GENERAL TECHNICAL SPECIFICATION FOR ELECTRICAL WORKS
8. This method may be adopted in places like indoor substations, air-conditioning plantrooms,
generator rooms etc. or where long horizontal runs of cables are required withinthe
building and where it is not convenient to carry the cable in open ducts.
9. This method is preferred where heavy sized cables or a number of cables are required to be
laid. The cable trays may be either of perforated sheet type or of ladder type.
PERFORATED TYPE CABLE TRAY
10. The cable tray shall be fabricated out of slotted/perforated MS sheets as channel sections,
single or double bended. The channel sections shall be supplied in convenient lengths and
assembled at site to the desired lengths. These may be galvanished or painted as specified.
Alternatively, where specified, the cable tray may be fabricated by two angle irons of
50mmX50mmX6mm as two longitudinal members, with cross bracings between them by
50mmX5mm flats welded/bolted to the angles at 1 m spacing. 2mm thick MS perforated
sheet shall be suitably welded/bolted to the base as well as on the two sides.
11. Typically, the dimensions details to be considered as per BOQ.
12. The jointing between the sections shall be made with coupler plates of the same material
and thickness as the channel section. Two coupler plates, each of minimum 200mm length,
shall be bolted on each of the two sides of the channel section with 8mm dia round headed
bolts, nuts and washers. In order to maintain proper earth continuity bond, the paint on the
contact surfaces between the coupler plates and cable tray shall be scraped and removed
before the installation.
13. The width of the cable tray shall be chosen so as to accommodate all the cables in one tier,
plus 30 to 50% additional width for future expansion. This additional width shall be
minimum 100mm. The overall width of one cable tray shall be limited to 800mm.
14. Factory fabricated bends, reducers, tee/cross junctions, etc. shall be provided as per good
engineering practice. (Details are typically shown in figure 3). The radius of bends, junctions
etc. shall not be less than the minimum permissible radius of bending of the largest size of
cable to be carried by the cable tray.
15. The cable tray shall be suspended from the ceiling slab with the help of 10mm dia MS
rounds or 25mmX5mm flats at a span spacing of 1mtr.
16. Flat type suspenders may be used for channels upto 450mm width bolted to cable trays.
17. Round suspenders shall be threaded and bolted to the cable trays or to independent support
angles 50mmX50mmX5mm at the bottom end as specified. These shall be grouted to the
ceiling slab at the other end through an effective means, as approved by the Engineer-in-
Charge, to take the weight of the cable tray with the cables.
18. The entire tray (except in the case of galvanized type) and the suspenders shall be painted
with two coats of red oxide primer paint after removing the dirt and rust, and finished with
two coats of spray paint of approved make synthetic enamel paint.
19. The cable tray shall be bonded to the earth Terminal of the switch bonds at both ends.
20. The cable trays shall be measured on unit length basis, along the center line of the cable
tray, including bends, reducers, tees, cross joints, etc. and paid for accordingly
LADDER TYPE CABLE TRAY
GENERAL TECHNICAL SPECIFICATION FOR ELECTRICAL WORKS
21. The ladder type of cable tray shall be fabricated of double bended channel section
longitudinal members with single bended channel section rungs of cross members welded
to the base of the longitudinal members at a center to center spacing of 250cm.
22. Alternatively, where specified, ladder type cable trays may be fabricated out of
50mmX50mmX6mm (minimum) angle iron for longitudinal members, and 30mmX6mm flat
23. Typical details of fabrication and dimensions of both the types of trays are shown in figure
4A, B, C and D.
24. The maximum permissible loading, jointing of channel sections, width of the cable tray,
provision of elbows, bends, reducers, horizontal tee/ cross junctions etc. suspension of cable
tray from the ceiling slab; painting and measurement of the cable tray shall be as per sub-
clauses (ii) to (x) below clause 2.6.11.2, except that the overall width of one cable tray may
be limited to 800mm.
13) Laying of Cables in Ground
1. Cable trench shall be dug to the minimum depth of 1 mtr and the width shall dependent on
the no of cables to be kept with the layer of brick in between two cables.
EXCAVATION OF TRENCHES :
2. The trenches shall be excavated in reasonably straight lines.
3. Wherever there is a change in direction, suitable curvature shall be provided.
4. Where gradients and changes in depth are unavoidable, these shall be gradual.
5. The excavated soil shall be stacked firmly by the side of the trench such that it may not fall
back into the trench.
6. The bottom of the trench shall be levelled and shall be made free from stone, brick bats etc.
The trench shall then be provided with a layer of clean, dry sand cushion of not less than
100 mm in depth.
itfycaanbdleisn, stu
hleactioornesresshiastllabnecet.ested
The cable drum shall be properly mounted on jacks, at a suitable location, making sure that
the spindle, jack etc. are strong enough to carry the weight of the drum and the spindle is
8. Cable shall be pulled over rollers in the trench steadily and uniformly without jerks
and strains. The entire drum length shall be laid in one stretch.
9. However, where this is not possible the remainder of the cable shall be removed by `Flaking’
i.e. By making one long loop in the reverse direction.
10. After the cable has been uncoiled and laid into the trench over the rollers, the cable shall
be lifted off the rollers beginning from one end by helpers standing about 10 meters apart
and laid in a reasonably straight line.
11. Cable laid in trenches in a single tier formation shall have a cover of clean, dry sand of not
less than 150 mm. above the base cushion of sand before the protective cover is laid.
GENERAL TECHNICAL SPECIFICATION FOR ELECTRICAL WORKS
12. In the case of vertical multi-tier formation after the first cable has been laid, a sand
cushion of 300 mm shall be provided over the initial bed before the second tier is laid.
13. Finally the cables shall be protected by second class bricks before back filling the trench.
The buried depth of uppermost layer of cable shall not be less than 750mm.
14. Back Filling : The trenches shall be back filled with excavated earth free from stones or
other sharp edged debris and shall be rammed and watered, if necessary, in successive
layers not exceeding 300 mm. Unless otherwise specified, a crown of earth not less than
50 mm in the centre and tapering towards the sides of the trench shall be left to allow for
14) Route Marker
1. Route marker shall be provided along straight runs of the cables not exceeding 30 meters
also for change in the direction of the cable route and underground joints.
2. Route marker shall be of cast iron painted with aluminium paint.
3. The size of marker shall be 100 mm dia with “Cable” and voltage grade inscribed on it.
15) Testing of Cables
1. Cables shall be tested at works for all routine tests as per IS including the following tests
before being dispatched to site by the project team.
a) Insulation Resistance Test.
b) Continuity resistance test.
c) Sheathing continuity test.
d) Earth test.(in armoured cables)
e) Hi Pot Test.
2. Test shall also be conducted at site for insulation between phases and between phase and
earth for each length of cable, before and after jointing.
3. On completion of cable laying work, the following tests shall be conducted in the presence of
the Owner’s site representative.
f) Insulation Resistance Test( Sectional and overall)
g) Continuity resistance test.
h) Sheathing continuity test.
4. All tests shall be carried out in accordance with relevant Standard Code of Practice and
Electricity Rules.
5. The Contractor shall provide necessary instruments, equipment and labour for
conducting the above tests and shall bear all expenses in connection with such tests.
6. All tests shall be carried out in the presence of the Owner’s site representative, results will
be noted and signed by all present and record be maintained.
16) WORKMANSHIP
GENERAL TECHNICAL SPECIFICATION FOR ELECTRICAL WORKS
1. Cables shall be laid in the routes marked in the drawings. Where the route is not marked,
the Contractor shall mark it out on the drawings and also on the site and obtain the approval
of the CLIENT AND/OR ITS ARCHITECT before laying the cable.
2. Procurement of cables shall be on the basis of actual site measurements and the quantities
shown in the schedule of work shall be regarded as a guide only.
3. Cables shall be laid on walls, cable trays, inside shafts or trenches.
4. Saddling or support for the cable shall not be more than 500 mm apart. Plastic identification
tags shall be provided at every 30 m.
5. Cables shall be bent to a radius not less than 12 (twelve) times the overall diameter of the
cable or in accordance with the manufacturer's recommendations whichever is higher.
In the case of cables buried directly in ground, the cable route shall be parallel or
6. perpendicular to roadways, walls etc unless marked on drawing by architect / consultant.
Cables shall be laid on an excavated, graded trench, over a sand or soft earth cushion to
provide protection against abrasion.
8. Cables shall be protected with brick or cement tiles on all the three sides as shown on
drawings. Width of excavated trenches shall be as per drawings.
9. Back fill over buried cables shall be with a minimum earth cover of 750 mm to 1000 mm.
The cables shall be provided with cables markers at every 10 meters and at all loop points.
10. All cables shall be full runs from panel to panel without any joints or splices.
11. Cables shall be identified at end termination indicating the feeder number and the
Panel/Distribution board from where it is being laid.
12. Cable termination for conductors up to 4 sq.mm. May be insertion type and all higher sizes
shall have compression type lugs.
13. Cable termination shall have necessary brass glands. The end termination shall be insulated
with a minimum of six half-lapped layers of PVC tape. Cable armouring shall be earthed at
14. In case of cables entering the buildings. It would be done duly only through pipes. The pipes
shall be laid in slant position, so that no rainwater may enter the building.
15. After the cables are tested the pipes shall be sealed with M. seal & then tarpaulin, shall be
wrapped around the cable for making the entry watertight.
16. Testing : MV cables shall be tested upon installation with a 500 V Meggar and the following
readings established:
16.1 Continuity on all phases.
16.2 Insulation Resistance.
16.3 Between conductors.
16.4 All conductors and ground.
16.5 All test readings shall be recorded and shall form part of the completion
16.6 Cable joints shall be done as per regular practice and check shall be carried out for
loose connections and leakages. Insulation cutting shall be done properly taking care
GENERAL TECHNICAL SPECIFICATION FOR ELECTRICAL WORKS
that no area of the conductor remains exposed. Crimping shall be done with the help of
hydraulic tool. Proper insulation tape shall be applied at the cable and lug joint.
17. Format for cable testing certificate :
a. Drum no. from which cable is taken :
b. Cable from to
c. Length of run of this cable mtr
d. Insulation resistance test
Between core 1 to earth mega-ohm
Between core 2 to earth mega-ohm
Between core 3 to earth mega-ohm
Between core 1 to core 2 mega-ohm
Between core 2 to core 3 mega-ohm
Between core 1 to core 3 mega-ohm
e. High voltage test: Voltage Duration
Between core and earth
Between individual cores
18. The cable shall be laid side by side in trench with brick covering on all the three sides.
19. The trench shall be such that sharp bends shall be avoided while laying the cable.
20. The bedding of fine sand under the cable shall be not less than 6 mm. The trench shall be
terminated in Manholes with specified size of R.C.C. Hume pipes as shown in drawing. Cable
markers shall be provided through out the route of cable at 10 mtrs distance.
21. The trenches shall be refilled after the cable are laid and the Ground level shall be done as
per original after pressing the same. The cables shall be checked for insulation resistance
and continuity tests shall be carried out.
17) MODE OF MEASUREMENT:
17.1 Mode of Measurement for Cable Trench & Cable Tray.
The cable laying shall be measured in rmt. The trenches dug and refilled shall be
measured in cu. Mtr. The bricks and sand bedding shall be measured in rmt. The cable
trays shall be measured in rmt.
17.2 Mode of Measurement for Cable and Cable End Terminations.
The cables shall be measured in rmt and terminations on unit basis.
GENERAL TECHNICAL SPECIFICATION FOR ELECTRICAL WORKS
5 TECHNICAL SPECIFICATION FOR INTERNAL WIRING.
1) SYSTEM OF WIRING
1. The system of wiring shall consist of PVC insulated copper stranded conductor flexible FRLS
wires in metallic / non metallic (Rigid heavy/Medium Duty ISI -marked fire retarded PVC
Conduits of minimum 2mm Wall thickness and Sizes of conduits shall be 25 mm dia.
conduits for both mains and point wiring and shall be concealed or surface mounted above
false ceiling as called for.
2) GENERAL DESCRIPTION
1. Prior to laying and fixing of conduits, the contractor shall mark the conduit route, carefully
examine the working drawings prepared by him and approved by the Consultant indicating
the layout, satisfy himself about the non interference in the route, sufficiency of number and
sizes of conduits, location of junction boxes, sizes and location of switch boxes and other
relevant details.
2. Any discrepancy found shall be brought to the notice of the Owner’s site representative.
3. Any modifications suggested by the contractor should get written approval before the actual
laying of conduits is commenced.
4. In laying of conduits it is important that not more than two right angle bends are provided
for each circuit without a pull box.
5. No junction box shall be provided in the entire length of conduit run for drawing of wires.
6. Only switch outlets, lighting fixture outlets, equipment power outlets and socket outlets
shall be considered for drawing of wires.
3) LIGHTING & POWER WIRING
1. All final branch circuits for lighting and appliances shall be single conductor/ stranded/
flexible wires run inside conduits.
2. The conduit shall be properly connected or jointed into sockets, bends, and junction boxes.
3. Branch circuit conductor sizes shall be as shown in the schedule of quantities and or
4. All circuits shall preferably be kept in a separate conduit up to the Distribution Board. No
other wiring shall be bunched in the same conduit except those belonging to the same
5. Each lighting branch circuit shall not have more than ten outlets or 800 watts whichever is
lower. Each conduit shall not hold more than three branch circuits.
6. Flexible cords for connection to appliances, fans and pendants shall be 650/1100 V grade
(three or four cores i.e. with insulated neutral wire of same size) with tinned stranded
copper wires, insulated, twisted and sheathed with strengthening cord. Colour of sheath
shall be subject to the CLIENT AND/OR ITS ARCHITECT’S approval.
7. Looping system of wiring shall be used. Wires shall not be jointed. Where joints are
unavoidable, they shall be made through approved mechanical connectors.
GENERAL TECHNICAL SPECIFICATION FOR ELECTRICAL WORKS
8. No such joints shall be made unless the length of the sub-circuit, sub-main or main is more
than the length of the standard coil.
9. Control switches shall be connected in the phase conductors only and shall be `ON' when
knob is down. Switches shall be fixed in 3 mm. thick painted or galvanized steel boxes with
cover plates as specified. Cadmium plated brass screws shall be used.
10. Power wiring shall be distinctly separate from lighting wiring. Conduits not less than
mm.and wires not less than 1.0 sq.mm. Copper shall be used.
11. Every conductor shall be provided with identification ferrules at both ends matching the
1. The entire installation shall be tested for:
Insulation resistance.
Earth continuity.
Polarity of single pole switches.
2. All the wiring switch board, outlet points shall be done in a concealed manner in wall & slab
in PVC conduit of minimum 25 mm dia. (medium gauge) & with 650v / 1100v grade PVC
insulated flexible copper conductor wire.
3. The switches should be modular with moulded cover plates, blank plates for outlet boxes.
4. The accessories, connectors, sockets, should be fixed with brass chrome / cadmium plated
machine screw. For fan points the rates should be with hum -free type 300 W regulators as
required to complete the point wiring.
5. The wiring shall be as per IS: 732 and IS: 4648. The wiring shall be done in a looping manner
so as to avoid junction boxes at any place.
6. All the looping shall be done only in the switchboard and outlet points. The size of the wire
shall be as per the specification. Colour code shall be strictly followed.
The size of wires shall as follow as per BOQ and as per clients requirements:
Light, fans, exhaust fan, 5 Amp. On board plug point, two way light points, bell point etc from
switch to outlet.
Phase / Neutral 1.5 m m2
9. From D.B. to switch board – lighting / 5 A socket etc – i.e. circuit mains part of point wiring
Phase / Neutral 2.5 m m2
10. From D.B. to 16A power point etc – i.e. circuit mains part of point wiring
Phase / Neutral 4.0 m m2
11. Separate pipes shall be laid for off wires and circuit mains.
GENERAL TECHNICAL SPECIFICATION FOR ELECTRICAL WORKS
12. Circuit mains of same phase shall be drawn in one pipe with prior permission/discussion
with the consultant.
13. Separate phase, neutral and earthing wire of sizes recommended by consultant shall be
drawn for each and every circuit mains.
14. Mains for lighting and on board plug points shall be of one-size higher wires than those used
5) COMPUTER WIRING :
1. Wiring for short extensions to outlets in hung ceiling or to vibrating equipments, motors
etc., shall be installed in flexible conduits. Otherwise rigid conduits shall be used. No flexible
extension shall exceed 1.25 m.
2. Conduits run on surfaces shall be supported on metal 12 mm. thick G.I. pressure saddles
which in turn are properly screwed to the wall or ceiling. Saddles shall be at intervals of not
more than 500 mm.
3. Fixing screws shall be with round or cheese head and of rust-proof materials. Exposed
conduits shall be neatly run parallel or at right angles to the walls of the building.
4. Unseemly conduit bends and offsets shall be avoided by using fabricated mild steel
junction/pull through boxes for better appearances.
5. No cross-over of conduits shall be allowed unless it is necessary and entire conduit
installation shall be clean and neat in appearance.
6. Conduits embedded into the walls shall be fixed by means of staples at not more than
mm. intervals. Chases in the walls shall be neatly made and refilled after laying the conduit
and brought to the finish of the wall but the building Contractor will do final finish.
7C .o nduits buried in concrete structure shall be put in position and securely fastened to the
reinforcement and got approved by the CLIENT AND/OR ITS ARCHITECT, before the
concrete is poured.
8P .roper care shall be taken to ensure that the conduits are neither dislocated nor choked at
the time of pouring the concrete suitable fish wires shall be drawn in all conduits before
they are embedded.
9. Where conduit passes through expansion joints in the building, adequate expansion fittings
shall be used to take care of any relative movement.
10. Inspection boxes shall be provided for periodical inspection to facilitate withdrawal and
removal of wires. Such inspection boxes shall be flush with the wall or ceiling in the case of
concealed conduits. Inspection boxes shall be spaced at not more than 12 meters apart or
two 90° solid bends or equal.
11. All junction and switch boxes shall be covered by 6 mm clear plate. These junction boxes
shall form part of point wiring or conduit wiring as the case may be including the cost of
removing the cover for painting and re-fixing. No separate charges shall be allowed except
where specially mentioned.
12. Conduits shall be free from sharp edges and burrs and the threading free from grease or oil.
The entire system of conduits must be completely installed and rendered electrically
GENERAL TECHNICAL SPECIFICATION FOR ELECTRICAL WORKS
continuous before the conductors are pulled in. Conduits should terminate in junction boxes
of not less than 32 mm. deep.
13. An insulated earth wire of copper rated capacity shall be run in each conduit.
The point definition shall be conduiting and wiring from D.B. to S.B. and there
from to final outlet point including switches and accessories, junction boxes, fan
boxes, zarri work with cement –sand etc of approved make.
1. All PVC insulated copper conductor flexible FRLS wires shall conform in all respects to
Standards as listed under sub-head Indian Standards and shall be IS approved and ISI
7) BUNCHING OF WIRES
1. Wires carrying current shall be so bunched that the outgoing and return wires are
drawn into the same conduit.
2. Wires originating from two different phases shall not run in the same conduit. All wires shall
have ferrules for identification.
3. Lighting and power circuits shall be separate. Each Power/ Light Circuit‘s Neutral shall be
individual per Circuit and shall not be looped from any other Circuit.
8) LOAD BALANCING
1. Balancing of circuits in three phase installation shall be as planned by the Consultants in the
tender drawings and shall be checked by the contractor before the commencement of wiring
and shall be strictly adhered to.
9) COLOUR CODE OF CONDUCTORS
1. Colour code shall be maintained as indicated by the Consultant for the entire wiring
installations. Red, yellow, blue shall be for three phases, black for neutral and green with
yellow band shall be for earthing.
10) WORKMANSHIP
Drawing Conductors
1. The drawing and jointing of PVC insulated copper conductor wires shall be executed with
due regard to the following precautions.
2. While drawing wires through conduits, care shall be taken to avoid scratches and kinks
which may cause breakage of conductors.
3. There shall be no sharp bends. Wire reel stands to be used for pulling of wires to avoid
4. Care shall be exercised while drawing the wires from reels, by taking appropriate measures
to ensure that wires are not spread on ground, causing dust and dirt accumulation on the
GENERAL TECHNICAL SPECIFICATION FOR ELECTRICAL WORKS
5. Maximum permissible number of 1100 volt grade PVC insulated wires that may be drawn
into rigid non metallic or PVC Conduits are given below.
Size of wires Nominal Maximum number of wires within conduit
Cross Section Area (Sq. size(mm)
6. Insulation shall be removed by insulation stripper only. Few Strands of wires shall not be
cut/reduced for convenience in connecting into terminals.
7. The terminals shall have sufficient cross sectional area to take all strands and its
connecting brass screws shall have flats ends.
All looped joints shall be connected through terminal block/connectors. The pressure
8. applied to tighten terminal screws shall be just adequate, neither too much nor too
less. All light points shall be terminated through a connector.
9. Only licensed wiremen (Before doing the work or before appointing him on site contractor
has to submit his wiring licence to Owner) and cable jointers shall be employed to do
10. Before entrusting cable jointing work to any technician, or before appointing Cable Jointers
or Wiremen on Site, Contractor has to submit such Technicians’ / Wireman’s / Cable
Jointer’s licence to Owner.
11. All wires and cables shall be embossed with the manufacturer’s label with ISI mark and shall
be brought to site in original packing. For all internal wiring. PVC insulated wires of
volts grade (FRLS) shall be used.
12. The sub-circuit wiring for point shall be carried out in loop system and no joints shall be
allowed in the length of the conductors.
13. No wire shall be drawn into any conduit until all defective work of conduit installation of
any nature that may cause injury to wire is completed.
14. Care shall be taken while pulling out the wires so that no damage occurs to conduits/wire
itself, the conduits shall be thoroughly cleaned of moisture, dust, dirt or any other
15. The minimum size of PVC insulated copper conductor wires for all sub-circuit wiring for
light points shall be minimum 1.0 sq.mm copper. Separate neutral to be pulled for each
16. Conduits shall be kept at a minimum distance of 100 mm. from the pipes of other
non-electrical services. And maintain minimum 300 mm distance between telephones, TV &
Computer piping.
GENERAL TECHNICAL SPECIFICATION FOR ELECTRICAL WORKS
17. Separate conduits/raceways shall be used for following points as applicable and as
requirements of site conditions:
17.1 Normal lights and 5 a 3 pin sockets on lighting circuit.
17.2 Separate conduit shall be laid from D.B. to switch board.
17.3 Power outlets - 15 A 3 pin 20 A/30 A, 2 pin scraping earth metal clad sockets.
17.4 Emergency lighting.
17.5 Telephones.
17.6 Fire alarm system.
17.7 Public address system & Music system.
17.8 For all other voltages higher or lower than 230 V.
17.9 T.V. Antenna.
17.10 Water level guard.
1. To facilitate subsequent drawing of wires in the conduit, GI fish wires of 1.0 mm (14 SWG)
shall be provided along with the laying of recessed conduit.
12) MODE OF MEASUREMENT
1. The items shall be measured on unit basis or on mtr basis as per BOQ.
6 TECHNICAL SPECIFICATION FOR LIGHT FIXTURES & ACCESSORIES.
1 The scope of work shall cover the supply, installation and testing of various types of LED
light fixtures.
Thefollowing standards and rules shall be applicable :
- IS 3646 - 1960 Code of practice for interior illuminator.
(B) IS 1913 - 1969 General and Safety requirements for
Electric lighting fittings.
(C) Indian Electricity Act and Rules issued thereunder.
1 All codes and standards mean the latest. Where not specified otherwise the installation
shall generally follow the Indian Standard Code of Practice or the relevant British Standard
Code of Practice in the absence of Indian Standard.
GENERAL TECHNICAL SPECIFICATION FOR ELECTRICAL WORKS
3) GENERAL REQUIREMENTS :
Tube Light with integral/ non-integral driver 20-22 Watts, Surge - 4KV,IP-20 LED
indoor fittings with LEDs of wattage 0.2 Watt to 0.5 Watt assembled on single
MCPCB, with housing used as a heat sink shall be made of thick sheet Steel
conforming to IS: 513/CRCA polyester powder coated and high U.V. & corrosion
resistance with diffuser and/or Polycarbonate optics with company mark/name
to 300 V, Power Factor more than 0.9, THD < 10 %,CCT 4000 K to 6500K, Uniformity
ratio >0.7,Luminaire efficacy> 100 lumens/watt ,LED driver efficiency > 85 %
LED Lamps integral type, cool white with PC diffuser suitable for B22 LAMP holder
to 8 watts LED indoor fittings with LEDs of wattage 0.2 Watt to 0.5 Watt assembled
on single MCPCB, with housing used as a heat sink shall be made of thick sheet Steel
conforming to IS: 513/CRCA polyester powder coated and high U.V. & corrosion
resistance with diffuser and/or Polycarbonate optics with company mark/name
to 300 V,Power Factor more than 0.9, THD < 10 %,CCT 4000 K to 6500K, Uniformity
ratio >0.7,Luminaire efficacy> 100 lumens/watt ,LED driver efficiency > 85 %
LED Panel Light with provision for Plane front frame with translucent cover fixed to
housing complete 24 watts, 300 x 300 mm, Surge-4 KV LED indoor fittings with LEDs
of wattage 0.2 Watt to 0.5 Watt assembled on single MCPCB, with housing used as a
heat sink shall be made of thick sheet Steel conforming to IS: 513/CRCA polyester
wi thp do iwffdues rercoa antde/doar nd high U.V. & corrosion resistance
Polycarbonate optics with company mark/name 120 to 300 V, Power Factor more
than 0.9, THD < 10 %,CCT 4000 K to 6500K, Uniformity ratio >0.7,Luminaire
efficacy> 100 lumens/watt ,LED driver efficiency > 85 %
LED Panel Light with provision for Plane front frame with translucent cover fixed to
housing complete up to 36 watts, 600 x 600 mm, Surge- 4KV LED indoor fittings with
LEDs of wattage 0.2 Watt to 0.5 Watt assembled on single MCPCB, with housing used
as a heat sink shall be made of thick sheet Steel conforming to IS: 513/CRCA
polyester powder coated and high U.V. & corrosion resistance with diffuser and/or
Polycarbonate optics with company mark/name 120 to 300 V, Power Factor more
than 0.9, THD < 10 %,CCT 4000 K to 6500K, Uniformity ratio >0.7,Luminaire
efficacy> 100 lumens/watt ,LED driver efficiency > 85 %
4) DRAWINGS AND DATA:
As per of the proposal the bidder furnish relevant descriptive and illustrative literature on
lighting fixtures and accessories and following drawings/ data for the respective lighting
i) Dimensional Drawings.
ii) Mounting details cable entry facilities and weights.
iii) Light distribution diagrams (Zonal & Isokandora)
iv) Light absorption and utilisation factors.
v) Lamp output V/S temp. Curves.
5) WORKMANSHIP:
The fixture shall be installed on wall / ceiling as directed and as per manufacturer's
instruction, with necessary accessories for surface, concealed, suspended from ceiling,
bracket mounting etc.
GENERAL TECHNICAL SPECIFICATION FOR ELECTRICAL WORKS
The job also includes connection of fixture with respective outlet point with heat resistant
wires through heat resistance sleeve and PVC connector. The exhaust fan shall be
installed complete with M.S. angle iron mounting frame/ ring, G.I. louvers, wire mesh and
plug at the end of the cord including wiring & earthing etc. Proper earthing shall be
provided to the fixtures.
6) MODE OF MEASUREMENT:
The unit rate shall be considered for fitting one fixture. The rate shall include following
1 All fixing accessories, mounting bracket, ballast condensers and control gear wherever
Supplying and fixing Ball and socket joints wherever required.
Earthing of fittings.
4 Electrical connections to fittings/fans from the junction box/ceiling rose.
5 Installation and interconnection of Electronic regulators for ceiling fans.
6 Supplying and fixing 300 mm. GI down rod for ceiling fans.
7 TECHNICAL SPECIFICATION FOR DATA, TELEVISION & TELEPHONE WIRING.
1) GENERAL DESCRIPTION
1. The work shall cover the supply and installation of the TV, Telephone and Computer data
points including laying of Cables in 19/20 mm dia PVC Conduit.
TELEPHONE CABLES AND WIRES:
1. The type of cables and the services shall be as follows:
2. Indoor – Multipair PVC sheath armoured / un-armoured as specified 0.6 mm tin Cu. Cable.
3. Outside -- Multipair PVC sheath armoured / jelly filled as specified 0.6 mm tin Cu. Cable.
4. All multi core cables and wires shall be of tinned copper conductor of not less than 0.6 mm
dia and shall be colour coded twisted pairs with rip cord.
The conductor resistance shall be less than 150 ohms per KM and the insulation resistance
between the conductors not less than 50 mega ohms and the nominal capacitance of about
0.1 microfarad per kilometre.
GENERAL TECHNICAL SPECIFICATION FOR ELECTRICAL WORKS
6. Cables laid underground or locations subject to dampness and flooding shall be filled with
polyethylene compound and shall have sufficient protection against moisture and water
7. All armouring shall be of galvanized steel wires and protected against corrosion by an outer
sheath of PVC in the case of indoor cables and polyethylene in the case of outdoor cables.
Outer sheathing must be fire retarding and anti-termite.
8. All un-armoured single core cables and inner sheath of armoured cables shall be provided
TELEPHONE TAG BLOCKS:
9. The telephone tag blocks shall be suitable for the multi core telephone cables and shall have
two terminal blocks, cross connect type. All incoming and outgoing cables shall be
terminated on separate terminal blocks and termination shall be silver soldered. The cross
connecting jumpers shall be insulated wires of same diameter and screw connected.
10. The tag blocks shall be mounted inside fabricated sheet steel boxes with removable hinged
covers and shall be fully accessible. The enclosure shall be painted with 2 coats of red oxide
and stove enamelled.
TELEPHONE OUTLET SOCKET:
11. Telephone outlet socket shall be of the same make as that of the switches and accessories.
The outlet sockets shall consist of 2 A 2 Pair polyethene connector in M.S.I / PVC boxes with
switch plate of the same make as that of switches and telephone socket. The telephone
outlet socket unless and otherwise specified shall be jack type and not pin type.
COMPUTER WIRES:
12. The computer wires shall be of 4 pair enhanced Cat 6 category and shall be of the makes as
specified in the tender.
COMPUTER DATA OUTLET SOCKETS:
13. The computer sockets shall be of e Cat 6 category and of the make specified in the tender.
The sockets shall be installed in the plates of the modular switches range to be used. The
sockets shall be crimped using crimping tool with the Cat 6e wire.
14. For clean room application the plates shall be of SS 316 with no sharp edges.
TELEVISION WIRING & SOCKETS:
15. The Co-axial cable shall be of wide band type with operation capability upto 500 MHz.as of
16. The Co-axial cable shall comprise of inner conductor of solid bare copper insulated with
Foam PE & Secondary Conductor made of poly-Aluminium film bonded Aluminium braids
and having coverage of 65%, overall sheathed with black PVC Insulation.
17. Twisted cables shall be electrolytic grade annealed copper conductor insulated with PE
insulation twisted in to pairs with colour combination bunched together in concentric layers
GENERAL TECHNICAL SPECIFICATION FOR ELECTRICAL WORKS
so as to minimize cross-talk & wrapped with FR PVC taps and sheathed with FR PVC or
HFFR outer jacket suitable for indoor telephone wiring and confirming to C-DOT S/WS-
113/ IEC 60189-2, UL-1581 SECTION
18. The ageing resistance of the co-axial cable shall comply with DIN 47252, Part 2, i.e. max.
5% increase in attenuation at 200 MHz. measured by artificial ageing (14 days at 80 deg.
1. All cables shall be on cable racks and neatly stitched together.
2. The connection at the tag blocks shall be silver soldered so as to achieve minimum
contact resistance.
The final branch connections with single pair cables in conduits and the maximum
number of cables in each conduit shall be as follows:
Conduit diameter Max. No. of cables
1" 25 2 Nos. single pair
1¼" 6 Nos. Single pair
32 12 Nos. Single pair
40 18 Nos. single pair
4. The tag blocks shall be mounted inside fabricated sheet steel boxes with removable hinged
covers and shall be fully accessible. The enclosure shall be painted with 2 coats of red oxide
and stove enamelled.
4) MODE OF MEASUREMENT
1. The wires, conduits and raceways shall be measured in rmt whereas the outlet sockets,
junction boxes and tag blocks shall be measured in units.
Technical Specification for Solar System:
This technical specification for a 25 kWp Battery-less (On-Grid) Solar Power Plant
is reorganized for maximum clarity, following industrial tender standards.
1. Solar PV Modules and Array
The Solar PV modules are the primary generation source and must meet stringent quality and
durability standards.
• Technology: Crystalline Silicon (Mono or Multi) using high-power cells.
• Total Capacity: 25 kWp (25000 Wp).
• Module Efficiency: Electrical conversion efficiency must be $\ge 12\%$.
• Power Tolerance: Rated output power must not vary more than $3\text{--}5\%$ from the
average rating.
• Certification Standards:
o Design Qualification: IEC 61215 / IS
o Safety Qualification: IEC 61730 Part I & II.
o Corrosive Atmosphere: IEC 61701 (for high-corrosion environments).
• Environmental Resilience: Satisfactory operation in humidity up to 100% and
temperatures between $-10^\circ\text{C}$ and $+65^\circ\text{C}$. Modules must
withstand wind gusts up to 200 km/h.
• Performance Warranty:
o $\ge 90\%$ of peak watt capacity at the end of 10 years.
o $\ge 80\%$ of peak watt capacity at the end of 20 years.
• Construction: High transmissivity, low-iron tempered glass front for superior light
transmission and a tough multi-layered polymer backsheet for high-voltage insulation.
1.1 Identification and Traceability (RFID)
Each module must include an RF identification tag (RFID) containing:
1. Manufacturer Name (Module and Cells).
2. Month and Year of Manufacture.
3. Country of Origin.
4. I-V Curve data.
5. Peak Wattage, $I_m$, $V_m$, and Fill Factor (FF).
6. Unique Serial Number and Model Number.
2. Module Mounting Structure (MMS)
• Material: Hot-dip Galvanized MS angles (Minimum size 50mm x 50mm x 6mm).
• Galvanization: Minimum thickness of 120 microns.
• Fasteners: All nuts and bolts must be high-quality Stainless Steel.
• Design Criteria:
o Designed for simple mechanical installation without on-site welding.
o Must withstand wind speeds of 200 km/h.
o Allows for easy replacement of any individual module.
• Foundation: Fixed and grouted in PCC (1:2:4) concrete columns.
• Ground Clearance: Minimum 500 mm from the ground level to the lowest part of the
3. Solar Power Conditioning Unit (PCU / Inverter)
Since this is a battery-less system, the PCU acts as an On-Grid Inverter.
• Function: Converts DC electricity from the array into high-quality AC power.
• Capacity: 25 kW nominal output.
• Protections: Integrated electronic protections against over-voltage, short-circuits, and grid
4. Junction Boxes (DCDB)
• Enclosure: Dust, vermin, and waterproof made of FRP / Thermo Plastic (IP65 for outdoor).
• Components: Copper bus bars of proper sizes, cable glands, and appropriate rating
blocking diodes.
• Function: Facilitates group array isolation and provides test points for quick fault location.
5. AC Distribution Board (ACDB)
• Placement: Located between the PCU and the Load Point.
• Metering: Equipped with an AC Voltmeter and Ammeter.
• Protection: Includes MCBs of suitable ratings for connection to the load and auxiliary
control room loads (fans, lighting).
6. PV Grade Cables and Accessories
• Standard: Conforming to IEC 60189 / IS 694 / IS 1554 (650V / 1.1kV grade).
• Conductor: PVC insulated, PVC sheathed Copper conductor.
• Efficiency: Cable sizing must ensure total electrical energy loss is $< 3\%$.
• Minimum Size: No conductor smaller than 4 sq. mm shall be accepted.
• Management: All wiring must be in a casing-capping system or conduits. Armored cables
are mandatory for underground burial.
7. Earthing and Lightning Protection
o Array structure grounded using GI pipe electrodes (4.5m long, 10mm diameter).
o Masonry enclosures with cast iron covers for earthing pits.
o Array structures and lightning conductors connected via 25mm x 5mm GI strip.
• Lightning Protection: Integrated system to reduce over-voltage to tolerable levels during
atmospheric disturbances.
• Safety: Danger Notice Plates (200mm x 150mm) in English and local language at the PV
Yard and Control Room.
Sr. No Component Specification Summary
1 Solar Array 25000 Wp (Using 330Wp+ Modules)
2 Inverter 25 kW On-Grid PCU (1 Unit)
3 Mounting Hot-dip Galvanized MS (120 Micron)
4 Voltage Grade 1.1 kV (Copper Cables)
5 Grounding GI Pipe Electrodes as per IS:3043
1. Solar PV Modules & Traceability
The system shall utilize high-efficiency crystalline silicon modules. Each module must be designed
to withstand extreme environmental conditions while maintaining peak performance.
1.1. Technical Parameters & Data Sheet
The bidder must furnish the following data for the proposed modules:
Parameter Specification Requirement
Module Make & Country Any MNRE approved / IEC 61215 certified
Module Type Mono / Multi Crystalline Silicon
Peak Power ($P_{max}$) $\ge$ 330 Wp per module
Electrical Efficiency $\ge$ 12%
Frame Material Corrosion-resistant material (Electrolytically compatible)
Junction Box Weather Resistant HDPE (IP55/IP65) with Cable Glands
Parameter Specification Requirement
Operating Temperature -10°C to +65°C
Wind Resistance Up to 200 km/h
Max Temp. Rise Over Max Ambient (to be specified by bidder)
1.2. Identification and RFID Requirements
As per ISO 9000 series, each module must contain an RFID tag embedded inside the laminate with
the following data:
• Name of Manufacturer (Module & Cells).
• Month/Year of Manufacture and Country of origin.
• Unique Serial Number and Model Number.
• I-V Curve for the module.
• Peak Wattage, $I_m$, $V_m$, and Fill Factor (FF).
• IEC Qualification Certificate details and name of the issuing Test Lab.
2. Module Mounting Structure (MMS)
The structure must be robust enough to support the modules for 25 years without site welding.
• Material: Hot-dip Galvanized MS angles (Min 50mm x 50mm x 6mm).
• Galvanization: Minimum 120 microns thickness.
• Foundation: Legs grouted in PCC (1:2:4) concrete columns.
• Ground Clearance: Minimum 500 mm from the lowest part of the module.
• Hardware: All nuts, bolts, and washers must be high-grade Stainless Steel.
• Design: Calculated based on site Latitude/Longitude for maximum energy output.
3. Power Conditioning Unit (PCU) & Distribution
3.1. PCU (Inverter)
• Rating: 25 kW (Battery-less / On-Grid).
• Function: Converts DC to AC and synchronizes with the grid.
• Protection: Built-in protection for over-voltage, short-circuit, and anti-
3.2. AC islanding.
Distribution Board (ACDB)
• Installed between PCU and Load point.
• Includes MCBs of suitable ratings.
• Equipped with AC Voltmeter and Ammeter for output monitoring.
4. Junction Boxes & Cabling
• Junction Boxes: FRP/Thermoplastic construction, dust/waterproof (IP65 outdoor, IP21
indoor). Includes blocking diodes and copper bus bars.
• Cables: 650V/1.1kV grade PVC insulated copper cables (IS 694/1554).
• Energy Loss: Sized to ensure total DC/AC cable loss is < 3%.
• Installation: Casing-capping for internal wiring; armored cables for underground burial.
5. Earthing & Safety Protection
• Earthing: GI pipe electrodes (4.5m long, 10mm dia) as per IS:3043.
• Conductors: 25mm x 5mm GI strips for array structures; tinned copper strips for the
• Lightning Protection: Dedicated system to neutralize atmospheric surges.
• Signage: Red Danger Plates (200mm x 150mm) at the PV yard, Control room, and Battery
6. Commissioning & Logistics
• Scope: Includes supply, installation, testing, and commissioning in the presence of VMC
• Tools & Display: A maintenance tool kit and a 3ft x 3ft Display Board (showing the circuit
diagram) must be provided.
• Insurance: Ex-factory insurance coverage until successful commissioning and acceptance.
• Warranty: Output peak capacity $\ge$ 90% at 10 years and $\ge$ 80% at 20 years.
Executive Summary: 25 kWp On-Grid Solar Power Plant
Component Detailed Specifications
1 Solar PV Modules 25000 Wp (Total Capacity)
(a) Module Make Any MNRE approved or IEC 61215 (Revised) certified
(b) Individual Rating 330 Wp or higher per module (or equivalent)
(c) Quantity Quantity depends on individual module wattage
Custom-designed as per available site footprint (Hot-dip
2 Mounting Structure
25 kW On-Grid Inverter (1 No.); must meet tender
3 PCU (Inverter)
design specifications
PVC Copper cables with surface/recessed casing-capping (As per
site requirement)
Transmission & Transmission, Distribution, and Point Wiring (As per site
Wiring requirement)
1 Set (Includes monitoring, control, and integrated protection
6 Control & Protection
7 Metering 1 No. (AC Side) Generation Meter for performance tracking
8 Spares & Hardware 1 Set (Includes required fuses, screws, terminals, etc.)
Key System Features
• Grid Interaction: This is a battery-less, on-grid system designed to export excess power back
to the grid (if net metering is applied).
• Safety Compliance: Includes standard protection against over-voltage, short-circuits, and
• Durability: Module mounting structure is designed to withstand local environmental loads
and wind speeds up to 200 km/h.
TECHNICAL SPECI. OF HVLS FAN
DESCRIPTION GEARLESS 24 ft HVLS FAN
Model Number 24 PMSM HVLS FAN B6
Diameter 24 FT (7.3M)
Blade 240mm wide Cambred Airfoil
Number of Blades
Noise Level (dBA)
Packed Hub Assy (Kg)
Packed Blades (Kg)
Installed Fan weight (Kg)
CE certification of whole fan assembly YES
PERFORMANCE ( AT MAX SPEED )
Coverage (sq ft)
Maximum Speed (rpm) 0-55 (controllable)
Power Usage (kW) max 1.5Kw
Maximum Effective Diameter (m) Approx. 30m dia.
Frame MS IS2026
Blades Aluminium Alloy 6063 T6
Blade and Hub Connection direct surface single joint connection
SAFETY COMPONENETS
Safety Cables 5 point safety system
Guy Wires 3mm guy wires
Safety Ring & Safety Clips for antifall
MOUNTING HARDWARE
Standard Mount universal
Drop Extensions (option) optional as required
Universal Mount Universal Mount
GEARLESS/PMSM MOTOR
PMSM (Permanent Magnet
Synchronous Motor)
Insulation Class F
Enclosure IP54 Enclosure with PP Powder coating
Start/Stop, Speed control & Reverse
Forward with All Schneider switchgears
Control Option (Not Included)
Standard Power 3phase input
VEICHI VFD with safety features like
Voltage Safety for VFD and Motor over current protection, coated PCB to
protect from dust & moisture.
Motor & Gearbox 5 Years
Blades, Hub & Mounting System 10 Years
ready delivery. Special mounting and
Delivery extension length required 2 week for
Unloading in our scope
Electrical wiring from VFD to Fan in Customer scope
Electrical wiring from Mains to VFD in Customer scope
Scaffollding,Hydra and erection
in Customer scope
Power supply in customer's scope
Transportation in Customer scope
Technical Specification for DIESEL GENERATOR:
1. General System Requirements
• Capacity: 82.5 kVA (Prime Rating).
• Configuration: Silent, water-cooled, turbo-charged (after-cooled for
higher ratings), engine coupled with alternator on a common base
• Duty Cycle: Prime Power (PRP) as per ISO 8528-1.
• Compliance: Must meet CPCB IV+ emission and noise norms (Noise
level < 75dB(A) at 1 meter).
2. Engine Specifications (The "Heart")
• Speed: 1500 RPM.
• Governor: Electronic Governor (Class G3 as per ISO 8528-5) for
precise frequency control.
• Starting System: 12V/24V DC electrical start with battery charging
• Safety Protections: High water temperature (HWT).
o Low lube oil pressure (LLOP).
o Over-speed trip.
o Low fuel level alarm.
3. Alternator Specifications
• Type: Brushless, self-excited, self-regulated (AS440 or equivalent
• Voltage: 415V, 3 Phase, 4 Wire.
• Frequency: 50 Hz.
• Power Factor: 0.8 (lagging).
• Insulation: Class H.
• Enclosure: IP65 minimum protection.
4. Acoustic Enclosure (Silent Canopy)
• Material: 1.6mm to 2mm CRCA (Cold Rolled Close Annealed) steel
• Insulation: High-density rockwool (PU foam is usually rejected for
• Painting: Pure Polyester powder coating (A 7-tank process for
corrosion resistance).
• Environment: Must be weather-proof and suitable for outdoor
installation in Gujarat’s heat.
5. AMF (Auto Mains Failure) Control Panel
• Controller: DeepSea, Woodward, or ComAp (Microprocessor-based).
• Logic: Automatically starts the DG set within 10–20 seconds of a grid
power failure and switches back when power returns.
• Switching: Motorized MCCB or ACB (for higher kVA) with
mechanical and electrical interlocking.
List of Makes: Electrical
1 LT PANELS CPRIAPPROVEDPANELBUILDER.50KA
SHORTCIRCUITWITH STHANDSTRENGTH.
2 DISTRIBUTION BOARDS LEGRAND/ SCHNIEDER / HAGER / ABB
3 MEDIUM VOLTAGE CABLE DIACAB/AVOCAB/POLYCAD /FINOLEX / RRKABLE /
KEI / HAVELLS / GLOSTER/ALLCAB
4 CABLE TRAY ( ALL TYPE ) PROFAB / PRECISION / THINKTRECK
/ UNIVERSAL / INDIANA / KEW
5 LT SWITCHGEAR (ALL RANGE) ASPERSPECIFIEDPANELDISCRIPTIONIN BOQ.
MODEL AS PER SPECIFIED IN BOQ
ABB/SIEMENS/SCHNEIDER/LEGRAND
6 LT MCCB SIEMENS / SCHNEIDER / LEGRAND / ABB
7 LTMCB,ELCB LEGRAND / SCHNEIDER / HAGER /ABB
8 LT SFU SIEMENS / SCHNEIDER / C&S / L&T / ABB /
9 LT CONTACTORS SIEMENS / SCHNEIDER / L&T / ABB / C&S /
INDOASIAN / LEGRAND
10 CHANGE OVER SWITCH HPL / ABB /L&T/ INDOASIAN / C&S
11 METERS (ANALOG) ENERCON / CONZERVE / SCHNEIDER /
SECURE/ABB/MECO/IMP/RISHABH/
AUTOMATICELECTRIC/NIPPEN
12 INDICATING LAMP SIEMENS/SCHNEIDER/L&T/BINAY/ABB
/ KAPPA/ PRECIFINE/ TEKNIC / C&S
13 ELECTRIC TIMER SIEMENS / L&T / LEGRAND/CONSERVE /
14 ROTARY SWITCH SIEMENS/SCHNEIDERELECTRIC/KEYCEE/ SALZER
15 PUSHBUTTONANDPUSHBUTTON SIEMENS / SCHNEIDER ELECTRIC / L & T / BINAY /
SET ABB / MG / BCH / RAAS CONTROL
16 SELECTOR SWITCH KEYCEE / SALZER / L&T
17 ANNUNCIATOR PROTON / EAPL
18 LUGS DOWELL’S / 3D / JAINSON / COMET / HMI
19 BIMETALLIC LUGS ISMAL / HMI
20 CABLE GLAND JAINSON / 3D / COMET / HMI
21 PVC CONDUITS AND ACCESSORIES PRECISION / NIHIR / POLYCAB
22 CASING CAPING PRECISION / NIHIR / POLYCAB / MODI
23 MODULARSWITCHES, SOCKETS & MK-WRAPROUND/LEGRAND-MYRIUS/ HAVELLS –
OTHER ACCESSORIES CRABTREE-ATHENA
24 KEYTAGPANELWITHCONTROL MK/LEGRAND
25 METAL CLAD SOCKET WITH MCB MDS / SIEMENS
26 PVC TAPE STEEL GRIP
27 PVC JUNCTION BOX SINTEX /CLIPSAL/NIHIR/PRECISION
28 WIRES FOR INTERNAL WIRING FINOLEX / RRKABLE / HAVELLS / POLYCAB /
29 COAXIAL TV CABLE DELTON / NATIONAL / HAVELLS / RR KABLE
30 CONNECTORS (COLOURS AS PER SALZER / ELEMEX / WAGO /
PHASE & NEUTRAL) CONNECTWELL/PHOENIX
31 LIGHT FIXTURES PHILIPS, CROMPTON, LT, HELONIX
32 CEILING FAN , EXHAUST FAN, HVLS CROMPTON, HAVELS,ORIENT, AUSTER, D&D,
FAN GOLDEN ENG.
33 LIGHTING PROTECTION MAP WORLD WIDE/
STERLING/INDELEC/EMTERPRISE/OBO/EQUIVALEN
34 ROOF TOP SOLAR POWER PLANT THORUGH GEDA’S EMPANELLED AGENCY ONLY
35 MOTOR PUMP SET KIRLOSKER/ CROMPTON/LUBI
36 MOTOR STARTER L&T, SIEMENS, GALCO,ALLICO
37 CABLE FINOLEX/INCAB/AVOCAB/KEI/POLYCAB/RR CABLE
38 Diesel Generator CUMMINS/TATA/MAHINDRA/SUDHIR
POWER/KOHLER/KOEL GREENS
List of Makes: Solar System
1 PCU / Inverter SMA, ABB India, Hitachi Hi-Rel, Delta Electronics, Schneider Electric,
Sungrow, Solaredge, Solis, Growatt
2 PV Modules Vendors listed in the Latest ALMM Order (Approved List of
Models and Manufacturers)
3 LT Switchgear & Enclosures L&T, Siemens, ABB, Schneider Electric, Hensel Electric, Urja
Techniques, Jayesh Electricals, Havells, C&S (Panel must be
4 Solar DC Cable LAPP, Siechem, KEI Cables, UniFlex, Cords Cables, Apar,
Universal, KEC, Leoni, Suyog Electricals, Polycab
5 AC Cable LAPP, KEI, Havells, Universal, KEC, GEMSCAB, Suyog
Electricals, Apar, Siechem, RR Cable, Polycab
6 Steel Structure (MMS) ESSAR, TISCO, SAIL, JINDAL
7 Earthing Pit Materials Ashlok, ERICO
8 String Junction Box (SJB) Hensel Electric, Trinity Solar, Eaton, Photon
9 Lugs Dowell, Comet, 3D, HEX
10 Cable Glands Comet, 3D
11 Optical Fiber Cable Polycab, RR Cable
12 Lightning Arrestor (ESE) Erico, Nimbus, AT (Spain), Ingesco, Indelec, Ashlok
13 Bi-Directional Meter SEMS, EDMI, or any DISCOM Approved Make
14 MCCB Siemens, ABB, Schneider, L&T
Compliance Notes:
• ALMM Compliance: For Solar PV modules, the bidder must ensure the specific model is listed
in the current ALMM (Approved List of Models and Manufacturers) as issued by MNRE.
• Grid Synchronization: The Bi-Directional/Net Meter must strictly follow the local DISCOM
(Electricity Board) specifications to ensure successful grid integration.
• Switchgear Safety: All LT panels must be sourced from CPRI (Central Power Research
Institute) approved vendors to guarantee short-circuit and temperature-rise compliance.
GENERAL TECHNICAL SPECIFICATION FOR ELECTRICAL WORKS
Signature of Contractor Signature of Deputy Executive Engineer
Signature of Executive Engineer
Signature of Superintending Engineer
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001 COMM Hall Vol -1_21.04.26.pdf
002 SBD_COMM HALL Vol 2_21.04.26.pdf
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